I've attached a song, you need Synth1. It happens in Pattern 1 on the line 11 and sometimes on line 43, too. You need sometimes a second play through before this bug happens. Seems for me a timing issue.
The "C-6" note get be cutted to early. I'm not sure why. It doesn't happen, when i'm using samples.
Renoise 3.1.1 64bit on Windows 10
Edited by toimp, 26 August 2018 - 21:27.