To avoid duplication of effort I'd like to announce that I'm working on a
Linux (ALSA sequencer + JACK) app based on the ZR-3 VSTi code that was
released on SourceForge.
The ZR-3 is described as a three-channel drawbar organ, and you can see
some reviews of the VSTi at
http://www.kvr-vst.com/get.php?mode=show&id=213
Right now I have the backend working so I hear organ sounds but I need
to do more work on the MIDI input (the VSTi understands raw MIDI bytes,
while ALSA sequencer sends event structures..) and obviously build some
kind of Linux GUI, probably with GTK+ 2.x
As far as I know this is the only VSTi for which source code has been
made available under a Free license. If you know of other instruments
that are available (and so could be amenable to the same transformation)
then please let the list (and thus me) know.
Nick.