Disappearing notes
Some notes did not play (no sound) randomly, if VST synths is set in mono or legato mode and with fast volume envelopes with no sustain. In my case it is PG8X https://sites.google.com/site/mlvst0/ and Helm https://tytel.org/helm/ and Synth 1. In poly mode no problems.
LMMS 1.2.1 x64, Windows 7 x64.
Could be a duplicate of https://github.com/LMMS/lmms/issues/2606
Possibly related to #5122.
@herodotas Can you provide a simple project that exhibits this issue?
Thanks - I've reproduced the bug. I don't think it's quite the same as #5122, but I would guess it's something similar with MIDI message timing/ordering. I'll investigate. You can work around it by using poly mode, as you noted, or by shrinking the notes in the piano roll ever so slightly so that they don't touch.