When you install Ardour on a fresh Debian install you will probably find that the sound isn't working.
Here's what I did to get it going.
sudo aptitude install ardour
I also installed these.
sudo aptitude install Qtractor
sudo aptitude install audacity
I installed these 2 to convert mp3s to ogg so I could import them.
Qtractor lets you import mp3 but ardour doesn't
sudo aptitude install ffmpeg
sudo aptitude install dir2ogg
To control/configure jack....
sudo aptitude install jack-tools qjackctl
This lets JACK and Pulse talk to each other, otherwise they lock each other out.
sudo aptitude install pulseaudio-module-jack
I'm not sure if I needed this, but this was one step:
sudo aptitude install linux-image-4.6.0-1-rt-amd64
This was the key: https://ubuntuforums.org/archive/index.php/t-986080.html
I would bet you need to look at the Ardour mixer and route the Main Output channel to your soundcard outs.
In Ardour press Alt+M (to view the mixer) then at the bottom of the Main Output strip there should be a button labeled Output - click that, then add your soundcard outs to the appropriate channels in the dialog box that pops up.
There shouldn't be any issue with the format of your wav file as ardour will resample things for you (at a better quality rate than ProTools actually).
This issue could also stem from you not having JACK configured correctly. In Ardour's open dialog, if you haven't already started the JACK audio server, there will be a tab that says audio setup - this is Ardour's own JACK startup script. It should work fine by default, but you should probably read up on JACK and qJackCtl.
To get Rosegarden going I used this page: http://gauthampai.livejournal.com/62383.html
The key to that was installing the soundfont, and qsynth.
Once you've got it configured and working, you also need to start qsynth before Rosegarden and have it running the whole time Rosegarden is. If you restart qsynth you'll probably need to restart Rosegarden for it to reconnect.
