(by the way, is there PowerPak for Famicom, because I have only access to Famiclones which rarely have NES cart port), would it play properly (in stereo) on actual console?

Also for second question, you didn't really answered it, because I already know that it can be done using Note Cut/Note off and envelope (id you want it to fade out), but I meant automated way, so I don't have to put also note cut/off since it is a chore in case of writing module with many bass-related stuff going on. But if FT doesn't support it, then it's OK.