If usability is involved, could you
summarize your main gripes?
* remember open and save file paths
* autoappend extension to saved files
* allow opening files without extension, see 2 ;-)
* improved parameter view
Actually, the CPU load is one of the most important things to fix so it
can be used with a polyphony more than 8. And some day it needs to be
ported from Qt3 to 4, so separating the GUI from the engine would be
helpful (if it's not done yet).
Just my two cents,
ce