I liked the 'boost' option on each sound which you could hit whilst playing, over using it on kicks and stuff just led to crippled, bit-crushed MAYHEM.
Still not seen much that can do that, either, at least not in quite the same manner. Amiga sound chip was FAT.
Octamed and Protracker were the tools of my trade for some time :-)
Oh, and MUSIC X but that just crashed all the ****ing time with midi stuff and wasn't too much use for anything else. I persevered though :-o