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Problems with presenting short tone sequences


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OS (e.g. Win10): Win 7
PsychoPy version (e.g. 1.84.x): 3.1.0 (64bit)
Standard Standalone? (y/n) Y


I have a problem with presenting short tone sequences. Imagine the following situation: Subjects hear two consecutive pure tones (30 ms each) with a short blank pause (30 ms) in between. When a set of consecutive stimuli (i.e., tone, pause, and tone) are repeated twice, I observed that the first tone in the first repetition is not delivered to a headphone.

I tried different combinations of tone durations and pauses. The capability of delivering short consecutive tones seems to depend on a tone duration and pause duration.

I suspect this is a hardware problem (soundcard: RealtekĀ® audio) and/or a stimulus loading problem?

Thanks for any help.