Sound has been a problem for me in the past. I found that the sound seems to work slightly better on Fedora than on Ubuntu. Ubuntu 12.04 has worked better for me, but I think things are still a little more flakey than I would like. Some of my problems might come from a USB docking station that has a sound plugin and some of the problems definitely come from Skype.
Anyhow, these are the tools that I am currently using:
- Audacity
- Sound Settings — switching between devices
- MuseScore