My macOS virtual mic driver is Apple's sample code. The hard part was a slider that did 0.00 dB
The Compression slider in my app moved the output by exactly 0.00 dB. Not "a bit too little". Zero, at two of three input levels, on real presets, and none of my existing checks caught it. It took five rounds to fix. The first four times I declared it done, the person listening in headphones heard nothing change. This post is about that bug and a few of its relatives. I hit all of them while…
The Compression slider in the author's macOS virtual microphone app moved the output exactly 0.00 dB, not by even a slight amount. Zero, on multiple input levels and input presets, despite the author's multiple attempts to fix it. The bug took five rounds to resolve. The author's account provides insights into the challenges encountered during the development of a virtual microphone application for macOS.
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