Bought a piece of 12"x24"x22awg copper sheet metal last week and was fascinated by the warble noises it made when i picked it up out of the box. Recording: easy voice recorder (android) on a samsung s7. Post-processing: 2-pass noise removal with audacity due to fluorescent light hum and other background noise.
This is a metal latch on a gate, which i'm opening, and it closes automatically with a spring. Nice latch sounds. Night exterior. Recorded with: sanken cs-1e, fostex fr2le.
This was recorded with an h6 zoom recorder in zita park. I did this by dropping batteries on a metal covering, figured it could be used as some sort of impact sound.