Don’t know if it is related, but I found somthing funny, too. Might be related.
Steps to reproduce:
0.) Fire up renoise, standard default song
1.) Turn off your audio. You not want to hear this. Better just watch the effect in the scopes view.
2.) add old ringmod device to channel one, set amount to 100% and freq to max, phase to 0% (all other settings could work, too)
3.) create 1 sample loop in an empty instrument, use the drawing tool to make sample maximum dc
4.) add adhsr device to the standard modulation, set release to 60 seconds (maximum), maybe sustain to max also to accelerate the “effect”
5.) while watching the scope add c-4 notes of the dc hold instrument repeatedly to the channel with the ringmod (I did with a midi keyboard, maybe this matters as for the notes playing on in release-held mode)
at my first and only try on this, the ringmod got fucked just before the standard 0x40 line pattern was filled with notes - it would not produce full amplitude notes anymore, but strange low volume stuff I didn’t dare to listen to, maybe the coolest glitches of the world, but maybe the most ear destroying, who knows, I don’t…deactivating the ringmod showed that the dc instrument built up an enourmous dc beyond the scopes range. Heh, yeah, it maybe broke the internal state of that instance of the ringmod plugin. Maybe it will simply get an overflow somewhere internally with too large signal values (floating point numbers can climb the nuts, almost limitless if not capped, and very large numbers might break one or another calculation with rounding errors as 23 bits precision is the same regardless of the number scaling, I know this pain…).
And I’ve seen the cymbal synth here has release active and isn’t in mono mode, so it might be the same breakage, but just happening a lot slower because the dc buildup takes more time.