giuliomoro Hi @giuliomoro, Okay, so I ordered 2 Belas & 2 capes, and just tried running the code you sent on the second Bela/cape and this works. So, yes, it seems that there is some issue with the other capelet (either it is not connected properly as you said or it is somehow broken). I will look into this further and get back to you shortly.
In the meantime, there is an extremely loud hissing sound that occurs alongside the sine tone that will be problematic when delivering audio stimuli in an experiment. How can we optimally reduce this hiss? (e.g., is there a software filter in the Bela library for this)?