TuxGuitar - no sound in 14.04
I had the same problem, and I solved it this way:
sudo apt install tuxguitar-alsa tuxguitar-jsa tuxguitar-oss
after this, go to Tools->Settings->Sound and select Gervill as Midi Port.
In my case the problem arose after update to 14.04LTS. Apparently tuxguitar-alsa was the problem. I removed that package and tuxguitar started working fine again.