@vinicity I have not seen Spikeys project, but he tell me he had a usb keyboard working ( would be great to get a midi keyboard working ). A monophonic synth can only play one note at a time, in the past it was suggested it was the channel clicking and I did stop the channel before playing the new note but it made no difference. I just added code right now to make it rotate through channels each note and it still clicks so unless one of the devs know I don't know. We get this issue in sampling in real music with mismatched zero points in the waveforms. Maybe it's clicks in the audio engine in fuze maybe a dev can answer the issue. I know it does it one some "patches" and not others and only if you re press a note in about the first second, even if the note plays for several seconds, after that first second even on a troublesome patch it does not click.
Maybe the ADSR engine update will fix it.