Problem with audio loop

[Antonio.Madrid.Lopez]

Hello everyone.

I’m new to Python so I’m a bit lost in this, but got to a lab where they use Psychopy and let me a protocol I’m still not familiar to, so while I get to develop my skills, I elevate a question to you, in case you can help me faster!

The code, to post it simplified is something like this:

for trial in range(ntrials):
		
		trial_clock.reset()

		if trial not in probe_trials:
			metronome_sound.play()

So the experiment should make a beep, wait a bit, and then beep again, which obviously does not happen.

Maybe I’m missing something?

Thanks in advance

[Antonio.Madrid.Lopez]

Ok, I have been digging in the cound, and the metronome_sound.play() is actually a dependency of sound.Sound(“A”, secs).

The thing is, the loop is working, as I can print the number of the trial and it works properly, but sounds is only heard the first time.

I’m using the PTB import, and the person who let me the code says he fixed it by downgrading the version of everything.

Does somebody know if there is some bug that might be playing me?

[jonathan.kominsky]

I’ve encountered issues with generated tones where they only play once for some reason, but I’ve actually had better luck with that on newer versions using PTB than on older ones. You could try reverting to something like sounddevice or pyo audio libraries (which are now plugins I believe) and see if those work better than PTB.

It might also be OS-specific. Windows or mac?

[wakecarter]

Might this advice help?

Fixing sound delay and jitter in psychopy coder (windows + PTB)

Hi, In case it can be helpful to others, I am sharing some feedback regarding trials and errors while trying to get audio stimuli synchronised with triggers on Windows (and using the PTB back-end). In short: even when following the documentation’s recommendation on timing (e.g., presenting stimuli for a number of frames, presenting before logging etc), we had a 10-12ms delay between trigger and stimulus onset and a jitter of ~15-20ms amplitude. What worked in the end was to change the “wait_f…

[Antonio.Madrid.Lopez]

First of all, thanks for answering.

Well, the problem appeared both in Mac & Win11, so I don’t think the OS was the main thing. Notwithstanding, it actually solved downgrading to 2021.2.3 I think, so I assume it was actually the version. Maybe I can report it?

[Antonio.Madrid.Lopez]

Thanks for answering. I solved it downgrading, but might actually try and use that in a newer version. Will update with results to share the experience!