Not sure if this is worth diving into for 0.4.14, but there's a long standing SF2 bug that occurs when you mute and then unmute a SF2 track causing all 100+ notes to play at the same time.
When turning a SF2 track on/off this makes an awful sound.
dagon: I can confirm this behaviour. Pretty nasty actually.
andre silva: I can confirm this as well. It's not ultra-jarring, specially seeing as the sound mostly lasts for around 1/3 of a second, and that muting-unmuting isn't too common, but it's still considerably loud and rough.
stephane thomas: I also confirm. LMMS git master branch.
stian jorgensrud: Hate it, blow my ears up
Instrument: also render sound for MIDI-based instruments when muted
In order to provide smooth muting functionality (i.e. immediate proper
sound when unmuting) always render audio buffers for MIDI-based
instruments. This is more important than potentially reduced CPU usage