This is a strange bug. I'm using bristol 0.40.3 compiled from source on Ubuntu 9.10 Alpha 2 on an AMD X2 64-bit. In bristol, if I click a note with the mouse, it sounds perfectly. However, if I use my MIDI keyboard with bristol, when I press a key, the key on the screen depresses as expected, but the related note does not sound. I am starting bristol with:
startBristol -v -audio alsa -midi alsa -b3
And connecting my keyboard with:
aconnect 20 128
As I said, the strange thing is that bristol seems to be receiving the MIDI events properly because it updates the keys on-screen, the only problem being that the sound is not emitted when pressing a key on the MIDI keyboard. Again, when just using the mouse to press keys on-screen, the sound is fine, even in the same session! I haven't tested all emulations but this happens with all of the ones I usually use - B3, Mini and Voyager.
Bug aside, thanks for a great programme :-)