Rosegarden is a digital audio workstation program written in Qt. It acts as an audio and MIDI sequencer, scorewriter and musical composition and editing tool. It is intended to be a free alternative to such applications as Cubase.
MIDI setup first.is available in the [extra] repository. Be sure to install a
With Timidity and Pulseaudio
$ timidity -iA
This way, Rosegarden will not launch jackd and you'll still be able to hear sound from other running apps.