http://bugs.winehq.org/show_bug.cgi?id=20426
--- Comment #4 from Jörg Höhle hoehle@users.sourceforge.net 2010-03-10 09:56:07 --- What does aconnect -o (or -l or -lo, or -lx, I forget the exact options) report?
We need an update to the MIDI Wiki page!
On my system, aconnect (and winecfg) list one "MIDI through" port, which I believe is simply a connection to the serial port, where no HW is attached => no sound comes from that.
When either FluidSynth or Timidity are started in server mode, additional ports are seen both in winecfg and aconnect. If your aconnect shows nothing or solely that MIDI through port, then this is not a Wine bug, and you need to google to find out how to setup MIDI software synthesizer (do you have HW?) for your machine.
/dev/dsp: Device or resource busy
What other SW is using it? (lsof)