Sorry, forgot to add: System: Ubuntu 13.10 amd64 Packages: qsynth 0.3.6-2+fixed1, flyidsynth 1.1.6-2+nopulse1~raring1, vmpk 0.4.0-3+jack3~raring3.
In Ubuntu 13.04 everything worked perfectly, the problems started after upgrade.
Sorry, forgot to add: nopulse1~ raring1, vmpk 0.4.0-3+ jack3~raring3.
System: Ubuntu 13.10 amd64
Packages: qsynth 0.3.6-2+fixed1, flyidsynth 1.1.6-2+
In Ubuntu 13.04 everything worked perfectly, the problems started after upgrade.