Then again... a tiny footnote on Page 3 of the Tools for Tyros manual says that the Tyros Voice Editor and the File Utility programs are stand-alone applications OR OPT applications. That means you can open these programs from within a sequencer like Cakewalk Sonar 2.0. I assume that would also mean that the Tyros voice editor has or is also a Cakewalk instrument definition file. Funny the things you discover in the fine print...