Qtractor

Haiku - the open source (MIT) BeOS clone - really needs a killer multimedia
application to succeed.

If you can port yours I believe it could be THE ONE.

Check it out: http://www.haiku-os.org/

Keep in mind that Haiku uses PortAudio and media_server not ALSA nor
JACK...

Last but not least, here's some discussions by me around the topic:

http://www.haiku-os.org/community/forum/feature_request_jack_port
http://www.haiku-os.org/community/forum/multitrack_a_v_suite

Hope that inspires !