The loopback implementation for WASAPI seems to not pick up silent samples. To test, simply run simple_loopback.c with a wav file, have some silence in the recording, and then play it back. Any ...
Mono audio captured as paInt16 on WASAPI loopback device via sync Pa_ReadStream() API is distorted, while the callback capture works without problem. It sounds like wrong format or clipped. Sampling ...