I’m using PsychoPy Standalone 1.90.2 on Windows 7 and working on an auditory experiment. However, I have long-standing issues with crackling noises on different hardware whenever I want to play two sounds simultaneously.
In the very simple minimal example I have attached, a wave file and a PsychoPy beep are played at the same time. Removing either the wave or the beep shows that they both work perfectly when isolated.
However, when the beep onset is between 0.22 and 0.61, an annoying crackling sound appears. For onsets <= 0.21 s and >= 0.62 s, there is no crackling.
In case it helps, I have visualized the wave file using Matlab:
Does anyone have an idea why this crackling occurs? Can you reproduce it?
And help would be greatly appreciated!