Beat notes and/or envelope timing issue

[softrabbit]

Bug Summary

Beat notes and short envelopes don't mix well. Not that this is much of a problem in actual music making, but it might hint at some timing detail that could be improved. I tried to replicate this using 1/192 notes, but they were fine.

Steps to reproduce

Put i.e. Kicker in the B&B editor, set volume envelope to 0 on everything except hold=0.01 or so. Disable all other envelopes and LFOs, turn volume envelope amount to max. Turn on all steps and play the beat.

Expected behavior

A steady beat.

Actual behavior

See screenshot. The sound cuts in and out in a pattern that changes when adjusting the BPM. And of course it varies with the sample rate and oversampling, as well.

Screenshot

(3 instruments panned left/middle/right) that should be beating on every step of B&B editor for 8 bars).

Affected LMMS versions

Version 1.3.0-alpha.1.118+gab6da61e7 (win32/x86_64, Qt 5.9.8, GCC 7.3-win32 20180312). (e.g. master + PR #6000)

[softrabbit]

#4038 might be related.