When I use sound programs which uses MIDI output, the whole system freeze (keyboard and mouse not respond...).
For example: I start Rosegarden. I import MIDI-file. Then I select to use my synth as an output device (Korg X5D, if there is some things in midi which differs from synth to synth in someway). Then I press play and everything works fine. But then, suddenly, the music stops, mouse won't respond and keyboard also. All what I can do is to reboot my system using powerbutton.
Same problem occurs when I start TuxGuitar and install alsa plugin so I can use my synth as an output device. The whole system freezes after couple of minutes.
In lspci it seems that I have this kind of sound card:
00:1f.5 Multimedia audio controller: Intel Corporation 82801BA/BAM AC'97 Audio (rev 12)
I use gameport to connect my computer to synth.