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Usually I associate that sort of problem with *stopping* a sample (since the stop will almost never happen at a point where the wave is actually at zero). Interesting that FF might have problems at the beginning, since most samples do indeed start at zero. I'll explore around that. Cheers!

Edit: midiano.com is excellent! Super useful to be able to visualise MIDI's that way.

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I just went back and actually found the corresponding issue on my repository. Turns out it was firefox having issues with the setTargetAtTime function. I replaced it with linearRampToValueAtTime to get rid of the clicking sounds. I think for that to work I had to shift each note a little forward and then do a very quick ramp in the beginning. It does alter the sound a little though.

Also: Thank you! The idea is definitely derived from Synthesia but that isn't free anymore and I wanted to make it work in a browser :)

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