On Mon, 23 Jan 2006, Cesare Marilungo wrote:
  In Rosegarden open the dialog in
composition->studio->manage MIDI
 devices and check if your midi device is listed into 'Play devices'. 
 Listed and selected as the "MIDI output system device".
  Then, in the main sequencer editor, right click
on the channel you
 want to play and select that device. 
 Done.  All tracks unmuted (just to be sure);  no output from MIDI jack.
 I use an LED soldered to a DIN-5 socket as a tester, and aplaymidi
 produces the expected type of LED blinking if I use it to "play" a
 MIDI file.  This confirms to me (I believe) that both the hardware and
 the OS level support are functioning properly.  If there's something
 else I can do to provide additional confirmation whether that's true,
 I hope someone will suggest it.
  Hope this helps, 
 I'm seriously wondering about the fact that Rosegarden does not show
 up in
 JACK's MIDI "readable clients / output ports" list, and would appreciate
 confirmation of whether I should be expecting to see it listed there.
 
 I don't have Rosegarden listed in the "readable clients / output
ports"
 but If I play my midi keyboard through Rosegarden and then out to
 ZynAddSubFx it works.
 c.