MIDI to VMPK to QSynth to Audio?

Solution 1:

First of all, VMPK does not pass MIDI data through it. That means that if you use it to play notes it will output them, but if you'll provide it with MIDI input it will highlight the pressed notes, but will not output them. To enable passing MIDI to the output, go to menu Edit->Connections, select "Enable MIDI Thru on MIDI output", and confirm by pressing OK. This will get your MIDI connection to work as on the picture you provided, and QSynth will recieve the MIDI input from your external controller.

I am not sure how did you set up QSynth, as it cannot be deducted from these screenshots you have provided (silly QSynth!). However, there are some things you should make sure to get it to work:

• Use a soundfont, as QSynth will not make any sound without some. Click on the 'Setup' button, then in tab Soundfonts use the Open button to select a sf2 file (if you don't have one, install package fluid-soundfont-gm or fluid-soundfont-gs, or look for them on the web, as thousands of soundfonts are available for free). After that change QSynth will ask you to restart it's engine, allow him to, by answering 'Yes'.
• Afterwards, make sure the ALSA connections are as they should be (QSynth will reset it's when restarting the engine). Also, remember to connect it's audio output to system output in JACK's audio connections window.

I hope it will help you. Ask in case of any further problems :)