Keyboards.

The keyboards were mostly software plugins. The exceptions are the pad sounds on Treeline, which were a Roland sound module which models analog sounds. Listen To Treeline end. Most keyboards and sound modules have a couple of hundred sounds, of which usually about 10% are usable. The Roland, though, models all the old Moog sounds etc. and it's great.

There is also a Yamaha sound module used on TRB. I can't actually play keyboards to save my life, but I can compose parts on them. The performances are via the miracle of MIDI sequencing....