From QB64 Wiki
The _SNDRATE function returns the sample rate frequency per second of the current computer's sound card.
- SampleRate = _SNDRATE
- The sample rate frequency per second value returned can be any INTEGER value. Often it is set at 22050 or 44100.
- When used with _SNDRAW it can determine the time that a raw sound has been made. Example: t = t + 1 / _SNDRATE
- The sound card sample rate is determined by the sound card and it CANNOT be changed!
See _SNDRAW example.