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I spun the front wheel of my bike and then held a pen against the spokes. This is what I recorded.
Recorded with Iphone 13 using the app "Röstmemo" (voice memo).
The app creates M4A-format (MPEG-4 audio). I convert to wav.
Stereo recording. Recording normalized -3dB.
Type
Wave (.wav)
Duration
0:35.036
File size
6.4 MB
Sample rate
48000.0 Hz
Bit depth
16 bit
Channels
Stereo