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OK Tried that. At first it said it lost the connection to Jack when I attempted to change the setup on Qsynth, and chose Jack under the audio tab, but finally it did connect. Here is the reading I got, after trying patchage:

loading driver ..
apparent rate = 44100
creating alsa driver ... hw:0|hw:0|256|2|44100|0|0|nomon|swmeter|-|32bit
control device hw:0
configuring for 44100Hz, period = 256 frames (5.8 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 32bit integer little-endian
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 32bit integer little-endian
ALSA: use 2 periods for playback
20:51:57.720 JACK connection change.
20:51:57.721 Server configuration saved to "/home/pedrobtu/.jackdrc".
20:51:57.722 Statistics reset.
20:51:57.767 Client activated.
20:51:57.770 Buffer size change (256).
20:52:02.188 JACK connection graph change.
20:52:02.203 XRUN callback (1).
subgraph starting at qsynth timed out (subgraph_wait_fd=9, status = 0, state = Triggered, pollret = 0 revents = 0x0)
bad status (-1) for client qsynth handling event (type = 8)
**** alsa_pcm: xrun of at least 1.125 msecs
20:52:02.205 ALSA connection graph change.
20:52:02.373 ALSA connection change
(and a few more of those as i played with patchage)

I was still faced with the same situation: I see a Qsynth input in Patchage, but no output, I wonder is it because of my Jack settings? Everything is set to default (interface, input and output devices, in and out channels, audio = duplex and the driver is set to alsa).
Jack works with all my other applications, I also tried my hand at Rosegarden yesterday, seems to work there too.

I just know it's some stupid little detail, but which one?

And by the way, here are the settings that worked with VMPK:
In Qsynth:
MIDI tab: Enable MIDI Input box checked
ALSA Sequencer Client ID: Qsynth1
Audio tab: Audio driver: alsa
Soundfonts tab: SFID 1; Name /usr/share/sounds/sf2/FluidR3_GM.sf2; Offset 0

In VMPK: -->Edit -->Connections: "Enable Thru on MIDI Output" checked
Input MIDI Connection
Output MIDI Connection FLUID Synth (Qsynth1):0

Thanks again for the advice, and for the software(s)...

Pierre