1,239 Royalty-Free Audio Tracks for "Raw"

Unedited recording made with zoom h5. Victorian style "twist" doorbell popular before electric doorbells. You twist the handle on the outside that rotates a double sided hammer onto the bell on the other side of the door. I could not find a recording when i looked. I initially made two recordings, i will likely make more later. This is a modern "cheap" recreation doorbell, as they are hard to find these days. I know some people with the genuine article on their home doors however i never get around to recording them. Recording done in theatre.

Unedited recording made with zoom h5. Victorian style "twist" doorbell popular before electric doorbells. You twist the handle on the outside that rotates a double sided hammer onto the bell on the other side of the door. I could not find a recording when i looked. I initially made two recordings, i will likely make more later. This is a modern "cheap" recreation doorbell, as they are hard to find these days. I know some people with the genuine article on their home doors however i never get around to recording them. Recording done in theatre.

Recorded with only a small digital video camera at a cafe in pushkar, india. As i sat by the lake one afternoon, two indians sat down on the ground in front of me and began playing this and singing. There is background cafe noises and the odd motorbike going by and beeps, people talking and its not great quality but, someome may like it. . . It is as natural as you can get, raw sounds of india!(unfortunately, i have no idea what they are saying, id love to know if anyone could translate it?)recorded september, 2012.

A high quality recording with a solid collection of various snow footstep sounds. There's sounds of slow walking, fast walking, running, jumping and kicking the snow. You should be able to get pretty much all you need for a game or a film in this recording regarding feet and snow. Recorded with a zoom h2 at 96 khz / 24-bit, truncated and saved to flac using audacity. I left some silence n the start if you want to denoise it yourself, but i think it shouldn't be necessary. It was really quiet.

A two minute section of angry mob/riot noise for a production of henry vi part 1, performed by italia conti 2nd year students in the italia conti sound studio. Stereo pair recording of 14 voices (fairly even mixture of male/female) for 2 minutes, featuring shouting, grumbling, and general riot noise - with some specific references to the play (e. G. "gloucester"). Raw, as recorded. Don't mind where used, but would appreciate a comment as i'd be greatly interested as to what you used it for.

When i first tested out my zoom h5 i began talking into the mic and then all of a sudden i needed a sneeze. I was about to stop the recording but then thought it would be good to record the sneeze to see how it handled my loudness. Well it coped very well and the recording came out perfect!i then played around with it in audacity and slowed it down -86% which makes me sound like a roaring lion. So i thought i'd upload this slowed down version too!.

At the close of the children's hospital telethon immediately after it was announced that more than $4 million had been raised, people on the phone banks started cheering, this as the closing credits were being run on the tv screen. This is non-descript cheering, my recording in a public setting having been invited as a journalist to be there to report for broadcast. There are no copyright issues associated with this recording. This is the raw sound, including a few noices when my microphone got tapped. Edit, process to your hearts desire.

A technical problem i had with my technics stereo cassette desk rs-5 where playback would deliver this fading squarewave at maximum volume. Apparently, it could have been an issue with the tape header wearing out. Thought i might as well upload it here, as i'm not sure anyone will be able to create this sound again. Note, this sound was de-amplifiied by 10 db in audacity 3. 1. 3. Simply put, the raw file was incredibly loud. If you're curious enough, you can increase it back up to its original volume, though i wouldn't advise it.

It's a recording of a man operating a chainsaw in a forest near an underground repair station. I've been biking through the forest whe i heard the chainsaw, so i stopped and recorded 7 minutes of him cutting off branches, tembers and walking around a bit. You can heat the chainsaw, natural forest reverb, sometimes a plane flying by or an undergroud train. The recording was made from around 20~30 meters from the sound source. Recorded with a zoom h2 (rear mics, hi gain, 96/24). Originally a 96khz / 24-bit wav file. Converted to flac using audacity.

Two contact microphones recording an engine from a mini cooper s in sport mode. Surprisingly aggressive-sounding. Intended to use for a race car asset. Contact microphones are stethoscope-like mics that you place onto a surface to record vibrations. This way, i was able to record the raw engine without wind or perspective. The left channel is the chassis and the right is the engine block. . . Blending the two together produces a great sound. Free to use.

Phonograph cylinder recording from Filaret Kolessa collection. This file contains the raw (unprocessed) signal from the cylinder no. 58, played at rate of 90 rpm, and is provided for research purposes. To hear the corresponding processed recording, please open File:Hnat Honcharenko - Nema v sviti pravdy 1.flac and File:Hnat Honcharenko - Nema v sviti pravdy 2.flac. Українська: Фонографічний запис із колекції Філарета Колесси. Цей файл містить «сирий» (необроблений) сигнал фоновалика № 58, відтворений на швидкості 90 обертів на хвилину. Цей файл збережено для дослідницьких цілей. Щоб послухати опрацьований запис, будь ласка відкрийте: File:Hnat Honcharenko - Nema v sviti pravdy 1.flac та File:Hnat Honcharenko - Nema v sviti pravdy 2.flac.

Recorded in june 2016 on a hudson yards-bound 7 train in the new york city subway. Towards the end of the recording, at the last stop (34th street–hudson yards), there is mta thank you announcement at the station and for all passengers to alight - i have extracted this announcement as a separate audio download on freesound if that's the sound clip you're interested in!. Recorded with a zoom h2n in 4-channel mode - this is the xy recording only (msg me if you want the raw ms recording!), without a windshield. File has not been modified.

I needed a rattle-snake sound for a tracklay so recorded myself shaking my salt and pepper grinders. Considering i recorded this on a stereo mic in the bedroom of my two-bed flat, i think it came out pretty well!. This is the processed version, which has been through noise reduction and high-pass filtering (soft cut off begins somewhere around 200hz). I believe that this has drastically improved the raw recording, but if you would like to use the original and process it yourself, feel free to send me a message and i will upload it. Recorded using my zoom h1 at 48k/32-bit (because i didn't realise it wasn't set to 96k. . . Whoops!).

This is a sample from the plug on the bottom of a shaving cream can getting pulled out and the resulting release of air pressure and shaving cream. If you're good enough at editing, you can make this into an explosion, a weapon, a hydraulic release, or some sort of gloopy lava bubbling sound, or anything else you can create with this. Feel free to use and edit this raw sample however you please. Credit would be nice but is not required. Recorded with a tascam dr07 disclaimer: potentially dangerous actions were performed to create this sound. I don't recommend attempting to recreate this and i'm not responsible for your actions.

Made this recording to share with the community. Please feel free to use it however you wish. No credit needed. Recorded what i was hearing outside my bedroom window. It's a combination of various sounds for about 33 minutes. I did normalize the track a little bit and added a low shelving eq filter. If you want the raw audio file to do your own clean up. . . Message me. There are mic bumps and movements that you'll need to take out or edit out. I hope it's may be useful for your project. The rustling sound coming from palm trees can be used for other types of trees blowing in the wind.

A background retro rain loop, created in milkytracker fromwhite and brown sound waves. If you use the resampler of your audio editing software,you can create different effects with this sample. Sounds like: "rain from indoors", "heavy rain", "light rain" etc. . . -----------------------------------------------------------------------. This sound, as well as everything else i have uploaded here,is completely free for anyone to use. |you may use this in any project, whether it becommercial, or not. You aren't even required to credit me,although that would be appreciated. |you may use any of my sounds however you please. I hope they are useful. 🎶.

4ch surround recording of a bike riding through city traffic (leipzig/germany) on an evening in late spring. Recorded with a zoom h2 with a rycote windshield in a shock mount fastened to the center frame above the pedals. All recordings in the set are raw from the recorder and will usually need a hi-pass filter to deal with the rumble. Steady riding and freewheeling along a minor street, with some cars and a scooter passing, some gear switching and stopping at a red light with cars passing on the intersecting street at the end. These are the rear channels, mics set to 120° dispersion.

Sound recording of a two tier mini waterfall into my small fish pond. Recorded with a tascam dr-07 mk ii. 24 bit, 44. 1 khz, stereo. First 10 seconds is the raw recording. Note the 60 hz hum due to the water pump being just under the water fall splash area. The last 20 seconds is the processed audio using ableton live 8 affects rack and the following affects. 1. Notch filter – 60 hz applied two times. 2. Lp filter –knee at 1 khz3. Hp filter-knee at about 3. 2 khz4. Granular delay – bubbling sound5. Chorus audio effect-snap, crackly sound. 6. Reverb-cave echo affect-high wet/dry7. Utility- for stereo width.

The staten island ferry "molinari" on final approach into st. George, staten island, late in the afternoon on april 04, 2021. The recording was made from the rear port side of the upper deck (where people are supposed to be quiet, but clearly don't obey the rules). Although the ambience is the in the public domain, the docking announcement over the pa system may need to be licensed through the dot. Note: this is a raw recording from a zoom h4n using the on-board x-y microphone. No processing has taken place. Ste-034. Wav, ambiance session on april 04, 2021.

Im sorry i haven’t been uploading lately… i really can’t give a reason as to why i haven’t been uploading any of the teaser kicks lately, nor have i given any download links for the actual xkicks volumes 1 or 2…. Ive actually finished xkicks volumes 1 - 6, each containing at least 250 unique distorted, hardstyle, gabber, obscure, noisy, nasty kicks, and i’m about to finish xkicks 7 real soon here. Ill be putting up the download links for xkicks 1 - 6 on my profile page on free sound:. Http://www. Freesound. Org/people/electroshocknetwork/. Here are various teasers from xkicks 1 - 6. Do you enjoy hearing incredible hard dance kicks? introducing the latest instalment of the xkicks series! xkicks edition 2 brings you 250 new, unique hard dance kicks that will keep you wanting more. Tweak them out with eqs, add effects to them, trim them to your liking, share your tweaked xkicks sounds. Only through the electroshocknetwork can you get sounds like this for free. Xkicks is back with an all-new package featuring 250 brand new, unique hard dance kicks. Xkicks edition 3 features kicks suitable for gabber, hardstyle, jumpstyle and any other harsh, raw sound. Add eq, trim them, add effects, change their pitch. Nothing is impossible to make now that xkicks has arrived. Native instruments meets electroshocknetwork in the latest instalment of the xkicks series! using the incredible “battery” to unleash the full potential of xkicks, electroshocknetwork has never made better raw, xtreme kicks. Featuring 250 unique hard dance kicks, xkicks edition 3 will leave you mesmerized and the crowd cheering as wave upon wave of awesomeness crashes over you.

This is almost the same kick drum i´ve uploaded previously, but this has more compression and overtones in the sub bass, along with an interesting technique i´ve been doing, lemme explain. . . I put the original sample twice in my daw (fl studio if you ask),leave the first sound like it is and the second sample is being equalized in a way that only the sub bass is being showed, so i added to that the saturation plugin ivgi2 from klangheim industries and slammed it with the plugin ott by xfer records about 9 times. Equalized the sound again to cut the sub bass and leave the raw high end sound you hear, finally added an izotope ozone imager to make it wider.

Chinese restaurant (portugal) about 10 x 10 mts large with 20 people inside. Sunday 9pm. Chatter (portuguese + other), chairs dragging, some noise from the street behind the big glass window in front; noise from the kitchen (cutting vegetables on wood, frying on wok, chatter in chinese). Mic pointing at the center of the room. In front a big avenue (door closed). On my right/behind is the kitchen on an open space. Recorded with zoom h4n-pro 48 khz / 24 bit. Use freely on your personal commercial and non-commercial projects. Don't put this raw sounds/files on youtube or anywhere else. You can use them in creative way as a part of art-form, but not "re-distribute" as (royalty free) stock material. Thank you.

Raw sound of lips kisses. Used to make these noises many years ago during high school lessons when i was bored in the classroom. Didn't aim it at anyone - did these noises when noone was looking - and just before someone looked, i stopped and pretended like it wasn't me. People didn't get mad though, lots were smiling, and some couldn't hold it for long and bursted out in laughter. It was 1000x better irl - if you're still in school, you should try it out after corona's gone. Note: make sure to check out the other matrixxx-sounds! the sound quality is always better when you download the sound(s)! ⛄. Enjoy!/matrixxx.

A group of 5 people - 4 guards and 1 nun (woman), walking fast from the distance until near the mic, stop, and then one man moves forward. Walking with boots on stone floor, sound of metal, swords, armours mixed with the steps. Two men and the nun carried a wireless mic. Recorded with sound devices at 48k 24bit in 6 channels. Channel 1: boom mchannel 2: boom schannel 3: boomchannel 4: man wireless micchannel 5: man wireless micchannel 6: woman wireless mic. Use freely on your personal commercial and non-commercial projects. Don't put this raw sounds/files on youtube or anywhere else. You can use them in creative way as a part of art-form, but not "re-distribute" as (royalty free) stock material. Thank you.

This is a single guitar string plucked with a pick directly at the headstock, that means between the tuners and the nut. There the string is very short and tight, resulting in a high, almost piano-like tone. Also, since there is no sound box, the tone is rather quiet. I used this for a sampler and i liked the sound of it. This is the raw recording. If you want to use it in a sampler too, i recommend adding some eq, reverb and maybe some delay. It is not perfectly in tune though, the closest note is a#. You might tweak the tuning a little bit when using it in combination with other tuned instruments. Microphone: akg perception 120post-processing: none.

Note: the high-pitched squeaks are artifacts from freesound's preview and aren't present in the actual recording. 10 minutes of a thunderstorm, recorded september 7th, 2019 from my apartment window in seattle. This is the raw recording straight from my zoom h5. Levels were kept low to minimize the chance of clipping. A few thunder sounds were still too loud, but luckily the h5 has a backup function that recorded an identical track 12 db quieter. I've uploaded that as well, so you can splice the two together to taste. Eventually i'll release a processed version with the two combined, plus compression and eq, but i wanted to upload the source material in case you'd prefer to diy it.

Blok modular set to bang on random keys/throw random parameters in various places. Sort of a kind of fm synthesis but i'm pretty sure blok can do a lot of extra things like place filters/waveshapers after the modulator but before the main oscillator. Don't want to give away much else but you can improv random textures by drawing in a waveshaper window/right-click to drag the drawing from one side to another. Also you can use the atan button to scale the notes on some sort of curve by distorting the note values. I could've added delay/reverb/eq/ ambience but i wanted it to be as dry as possible because that's personally what i look for, raw sounds that you can choose to change if you like. No edits aside from normalizing the. Wav file.

This sound was created as follows:. -zynaddsubfx free (and insanely amazing) software synthesizer generated simple g tone using a sine-wave adsynth engine- creative sbs 250 speakers played it back distorting the sound naturally and adding some interesting stereo phasing effects (is that caused by analog signal cable being longer for one speaker?)- i was manually changing the volume using the speaker's potentiometer (whitch is dirty and added some interesting noises on the right speaker, and also at peak loudness during the 54th second the right speaker is quiet)- the output was captured by zoom h2's rear mics- and recorded via usb into audacity free audio editing program- i exported the recording as 16-bit flac.

Sample of a metallic percussion hit. The sound is quite dark and muffled. I call it underwater drum, because it sounds to me like it's underwater. This sample is tuned to a1 but there is a very dominant overtone at b1, which is the musical interval of a minor second. The source of the sample was the platter of a dismantled hard disk drive, hit with a wooden mallet. It was then pitched down a lot. The sample is almost raw, i just added some slight eq. The sample was intended to be used with a sampler, you may want to add some reverb for this and filter the previously mentioned overtone, when you use it in combination with other tuned instruments. Also, the pitch is probably not perfectly tuned. Microphone: akq perception 120post-processing: pitch manipulation & eq.

English spring #gm0017 is the latest free sample pack from gowler music. Recorded in the month of april in the northern english country side, this sample pack features over one hour of ambient nature sounds including bird calls, wind and the occasional airplane overhead. Rather than cutting the raw files into shorter minute-long samples, we’ve decided to leave these samples ‘as is’ to give people more creative control of the content. With only a slight eq tweak and some channel boosting, these samples have been left relatively untouched to give a more realistic, true sound. Perfect for any music producer of film maker looking for real ambient nature sound effects, english spring #gm0017 can be downloaded for free now. Https://gowlermusic. Com/free-sample-pack-english-spring-gm0017/.

It's me jamming a bit using my epiphone's explorer (tuned to drop-d). Recorded with a zoom h2 via mic-in and a jack cable. Unprocessed an undedited recording. I tried out some licks and chords. I'm not a good guitarist. Nevetheless, this might be a nice recording if you're making an animation about learning musician, or a game with a band member rehearsing alone in a room, or if you want to just chill to my little jam session. This should be mono, but i calculated the difference between left and right channel and it is not zero. So i uploaded it as a stereo file. Could use some denoising. There is some silence at the beginning so you can do that if you need.

I was super inspired to post here again after an insane coincidence happened!. I was in an online class (thanks, covid) where we were supposed to redo all the sounds and music for an animation we chose. We were encouraged to use sound libraries and freesound. Org. In one classmate's animation, a sound he used seemed very familiar, and then it hit me. . It's my sound! from this site! the crazy part is he has my same first name. But anyway, thank you for taking a look and listen to this sound which is about 2 years old now, heh. I went to this exhibit about electronic and/or audio stuff. In the show they were doing on stage, they brought various tesla coils and things i forgot the name of. I decided to take a video. Within that video, is this sound! feel free to use this sound wherever, however, whenever you want. I ain't uploading on freesound for nothin'. ;d. The only processing i did was cutting out any talking during the raw recording.

Damaged smartphone screen protector being broken and crushed in bare hands (should've used gloves. . . ). Recorded with behringer b-1 microphone into focusrite scarlett 2i2 3rd gen. Into audacity on arch linux at 192 khz/24 bit. The recording was not processed or edited in any way to retain maximum flexibility to sound artists who will use this as an element. This can be useful as a sound effect for freezing or burning or deep-frying or even rain (when slowed down). Thanks to extremely wide frequency range the recording can be cleanly slowed down up to 25% speed. There's clean frequency content up to 80 khz in the recording. In a few places the mic gain was too much and a pop is clipped, but could still be useful for sound of braking or snapping something (bone?). No denoising was applied - perform your own if needed, though the sounds are mostly free of background hum (a bit of pc noise can be heard in the first minute before i turned down the gain).

sigil reel 2: percussion. Created by nathan moody, formatted for use in the make noise soundhack morphagene. This is one of two morphagene reels made from one-of-a-kind handmade electro-acoustic instruments and found objects created by sound designer and musician nathan moody, an outgrowth of his 2018 album, "the right side of mystery. ". This reel is focused on percussive, inharmonic content from found objects and one-of-a-kind handmade instruments including metal table tops, perforated steel gongs, stretched springs, steel tubes, a drum made from packing tape, shakers made of tin cat food lids, and much more. They were struck with rubber mallets, carbon fiber rods, drumsticks, and woolen tympani mallets. They were recorded with a variety of microphones (sennheiser mkh50, dpa 4061, audio-technica at4050, shure sm57 and beta 52a), through awtac channel amplifier and neve 511 preamps. The hits are gritty, raw, and harmonically complex often with long decays, holding up well to varispeed manipulation, decay-tail looping, and filtering. For more information about nathan moody and the sounds and instruments used on this reel, visit nathanmoody. Bandcamp. Com and music. Noisejockey. Net.

A peaceful ambiance of some pine trees in early, early spring. The predominant, lower-pitched background is the strong south wind blowing through the tops of healthy pine trees. . . An unwavering "swooshing" that cuddles and curls around the flexible, thick-resin-filled pine needles. Also, from time to time, you hear the sound of the wind rattling some dead and brown oak leaves; oak leaves which are still stubbornly hanging on to their parent tree. I purposely did only a very bare minimum of post-processing on this sound so as to keep it as realistic as possible. Yes, there are quite a few wind rumbles that i toned down just a little bit. I did not totally get rid of the wind rumbles. I did this on purpose so you the true feeling of " being there " on that mild, but still raw cold day of spring could still be felt. At 4:35 into the soundscape the trilling of a pine warbler is heard---a warble of warm-sounding notes fighting back stubborn winter. At 9:33 that hardy year-round resident, black-capped chickadee starts tweeting about. Recording made on saturday march 25, 2023 using a sound devices mixpre-3 series ii and only one microphone. I used a sennheiser mkh 8070. Enjoy this soundscape of winter slowly losing its grip, as told by pine trees and brown, crackly oak leaves.

Ringmodulated inversion of my speech from the file https://freesound. Org/people/kb7clx/sounds/648443/ invertedspeechcq. Wav. I took the raw recording and used goldwave's mechanize effect to translate my voice to a center frequency of 14khz. I then demodulated it first at 10. 6 and then 10. 2khz meaning that what comes out is essentially the opposite sideband, offset by 3. 4 and 3. 8khz respectively. 3khz just didn't sound as good. The first i filtered with a low pass of 2. 9khz, the second was filtered to below 3. 4khz to emulate a communications receiver passband. I am speaking upside down as described in this video. Https://www. Youtube. Com/watch?v=q_ykxzcbh-g beginning at 00:03:16. Being blind i can't see their diagram, but i've got my own by ear intuitive method, keeping in mind that oo and ee are farthest from each other, all other vowells get closer the closer they are to the middle of the human voice frequency range. I say: huhlay sue quee, sue quee, sue quee do ux. Cahlloong sue quee sue quee sue quee do ux. The ay in huhllay is like when a spanish speaker says béisbol (baseball). The a in cahlloong is like the a in cat if you're opening wide for the doctor. The oo is like the oo in book. Listen to the other file and you'll hear: hello cq cq cq dx. Calling cq cq cq dx.

This is a recording of myself sleeping, beginning ~ 1:00 am local time (~ 3hrs after going to bed) on january 10th, 2020 (which i later discovered was a full moon). I was in the midst of experimenting with recording myself all night long out of curiosity, using a laptop placed near the head of my bed. This particular recording was the only anomalous one (the rest consisting mostly of just breathing or snoring with occasional sleep-talking). This ~2 hour recording has several interesting properties, which make it hard for me to believe that these sounds were actually going on while i was sleeping. On the other hand, i don't have a memory of editing this file if i did. Either way, i find it unsettling. I found the file in oct 2021 while organizing my samples. As far as i can remember, this is the original raw recording. On further inspection, i discovered that it has some additional peculiar properties that make it even harder to believe i could have made it without remembering doing so. The audio spans almost exactly 118min (7080s). There’s a frequency sweep with a cycle-length of 6480ms that repeats throughout the entire recording. Dividing the 118min by 6. 48min (60 cycles) results in 18 parts containing exactly 60 cycles and a remainder of 12 cycles. If you think you know the source of the strange sounds or if you've ever heard anything similar, please let me know in the comments or email me at storyofthelie@protonmail. Com. I collected the most interesting bits into this pack:https://freesound. Org/people/storyofthelie/packs/33653/. Approximate times of weird stuff:. 25min - stretched cough41min - voice & sounds45min - metal hit & voice47min - call response55min - door latch1hr 3min - portal1hr 7min - more portal1hr 11min - open portal1hr 20min - echo voice1hr 23min - echo voice, tones, portal1hr 36min - stomp into breathing1hr 51min - echo voice1hr 53min - cycle tone change into crazy.

It's a 15-minute long drum improvisation. It contails a lot of different beats and rhythms played so you might cut-out some loops for your needs. The kit has:- single kick- snare- hihat- 3 toms- broken crash that sounds really short- ride. The kit was old and not in perfect condition. I also used my sticks to play on some other part of the drumkit, like metal stand for the crash etc. I also got up and stated running around in a circle hitting sticks together and afterwards hitting drums and cymbals while running around the drumkit. I took my shoes off before i started so you can't hear my footsteps. I didn't use a metronome and i know i don't hold the tempo and it's a bit wiggly sometimes. I think this performace was inspired by band mr. Bungle. I recorded this with zoom h2 handy recorder's front stereo xy mics. It was standing on a table about one meter above the floor. Facing the drumkit and me. It was captured into a 48khz/24-bit wav file, then i trimmed the ends and converted this to flac using audacity. No processing applied, though i think it sounds nicer when you put these effects:. 1. A compressor:-attack: 10ms-release: 50ms-ratio: 2. 5:1-treshold: around -24db2. A reverb:-decay: 1. 5 to 2 seconds-dry: 0db-wet: around -15 db. It amazes me how much energy compression actually adds to drums!. I made this with my podcast (http://unfamusic. Com/fnr/) in mind. I want to overdub guitars, vocals and make it one big schizophrenic song. If you're interested to hear it, leave me a comment so i can find you, or just subscribe to my podcast's rss (http://feeds. Feedburner. Com/unfa-fnr/).

We develop iphone app that perform musical analysis on recorded audio from the iphone. Our app implementation make use of the audio queue service to receive raw audio buffers from the audio queue callback. In the first version of our app we had the problem of too much clipping on the recording which degrade the accuracy of our analysis. We also suspected that the noise canceling algorithm in iphone 5 produce distorted sound, which is not much noticeable by human ear but distorted enough to affect our sensitive algorithm. We found that the solution to our problem is to set the audio session mode to kaudiosessionmode_measurement. This session mode is supposed to give maximum freedom for us to control the microphone input, which include turning off the automatic gain control and probably noise canceling as well. The solution works very well except that it introduce a strange waveform pattern in the beginning of all recordings in iphone 5. It is very hard to explain the waveform we get, so i made two recordings at freesound so that you can see it visually. The first recording is made in an almost quite environment, and you can see the weird spike in the beginning of the recording. The second recording (this recording) is made with constant background noise, and you can see that the actual sound wave is offset from the strange curve and gradually increase to its original volume. This waveform only happens on iphone 5 devices that we tested, and there is no problem at all for iphone 4s and older generations. We have tried various settings and the glitch is still unavoidable as long as we set the audio session mode to kaudiosessionmode_measurement. We also find similar glitch in one of our iphone 5 devices, in which the glitch happens even if we try to set just the input gain level without changing the session mode. We are not sure if this is a hardware-related bug in iphone 5, or if it is fixable software glitch in the future version of ios. For the moment we are looking for workaround that can avoid this glitch while automatic gain control and noise canceling are disabled.