Mono recording of a 440 hz tuning fork with resonance box, full decay time = more than 1 minute. I used the measurement microphone k4 by arnold esper placed directly in the resonance box. Recorded in the anechoic chamber for analysis and measurement purpose mostly.
I used 2 low frequency operators (lfo) on a low pass filter (24db) on a generic pink noise sound with medium resonance settings, one of these lfo's was manipulating the other one with a random ramp, to make it sound more diverse and realistic. I put an aditional long envelope on the q (resonance) also, not to mention some chorus at a low tempo to make it kinda binaural with a stereo delay at a short time setting. . . I hope you enjoy it!.
Ben burtt style retro laser gun blast made from hitting a long fence wire. I left more of the tail resonance on this one. This recording is unprocessed so you can shape it yourself.
Banging on a geometric metal sculpture with my hand and recording the long reverberations with a vintage sony f-98 cardioid mic plugged into my iphone 6. I used various parts of the hand, the palm, fingernails, fist, and knuckles.