I Use exactly this configuration, rosegarden for midi and ardour for recording and mixing and mastering (with jamin).. all you need is to put rosegarden as a jack slave (in preferences menu) and make ardour the master for jack so when you record or just listen it do transport on rosegarden too... if you're a windows user it work quite the same as reason and cubase via rewire... so when you're happy with your midi tracks just record them in ardour for mixing all together at this time you don't need rosegarden anymore... i forgot to say that there is an option in rosegarden to separate all audio channels so you can record each track separatly in ardour...<div>
The ardour team is working a lot a maybe in the next weeks there would be an alpha release of ardour 3 wich handles midi too... at this time Ardour will be the greatest DAW in world !!!!!!!!</div><div><br></div><div>so enjoy doing music</div>
<div>regards</div>