We’ve indeed fixed a small bug for 3.0.1 here. Volume fade commands should always apply the fade from the current volume, which either gets set by 0CXX or a volume command in the volume columns. If you want the volume to be applied to full volume. Explicitly set it and then do a volume ramp:
Ins Vol FX
C-4 01 .. 0C0A
--- .. 80 0OFF
--- .. .. 0C0A
--- .. 80 0OFF
In this example it may not really look like a bug, but in situations like:
Ins Vol FX
C-4 01 .. 0000
--- .. .. 0000
--- .. .. 0C0A -> set volume
--- .. .. 0I10 -> should fade from vol 00 instead of fading from full volume
--- .. .. 0I10
--- .. .. 0I10
--- .. .. 0I10