sudo apt install tuxguitar-alsa tuxguitar-jsa tuxguitar-oss
go to Tools->Settings->Sound and select Gervill as Midi Port
Gervill
https://askubuntu.com/questions/457321/tuxguitar-no-sound-in-14-04
https://www.jpmorgan.com/insights/outlook/market-outlook/eye-on-the-market-fifty-days-of-grey