PsyDuration is not accurate enough to represent the duration of the frame rate of audio

[maartenuni]

From the audio device, one can get a PsyDuration* that represents the frame dur.

E.g. The frame_dur of an PsyAudioDevice Sampling at 44100 Hz is 23µs according to the duration it is rounded to the nearest µs whereas it is 22.68... µs in reality.
So if you calculate the number of frames it takes to generate a PsyWave of 250 ms it is 10870, however 10870 * 1/44100 ~ 246 ms, hence the stimulus loses 4 ms. As aiming for ms precision, this isn't good enough, So we should try to improve the precision to calculate the number of frames that makes up 250ms.