[LAU] Problem getting started with Midi editing - no sound!

Rui Nuno Capela rncbc at rncbc.org
Mon Sep 14 20:49:05 UTC 2015

On 09/14/2015 08:42 PM, David Sumbler wrote:
> I have hesitated for weeks to post here with such a basic and possibly
> stupid problem, but I am at my wits end with this.
> I run Ubuntu 12.04 on a desktop computer and also on a small notebook.
> Sound is fine on both of them, and I can play midi files through
> tiMidity with no problem.
> I want to use a midi-capable electric piano as an input device, and I
> reckoned the first thing to do was to get some suitable software and
> make sure I could play a midi file from a midi editor.
> I have QjackCtl, Qtractor (I also have Muse) and Qsynth installed.  I
> have spent weeks, on and off, trying to solve the basic problem of
> getting some sound from Qtractor (or Muse), but although both the editor
> and QjackCtl show that an imported midi file is actually being played, I
> get no sound whatsoever.  This is true for both computers, even though
> their hardware is pretty different.  As I said earlier, the sound on
> both computers is fine in other contexts, so it is almost certainly some
> fundamental error on my part, but I have no idea what is wrong.  I have
> tried all sorts of different sets of connections in QjackCtl, but never
> heard a note yet!

1. make sure qsynth has a proper soundfont file (*.sf2) loaded in;
2. make sure qsynth midi input driver is set to "alsa_seq" and audio 
output driver is set to "jack";
3. on qtractor, load the midi file from menu track/import tracks/midi... 
or just drag and drop the file into the main canvas;
4. connect qtractor's midi master/out to qsynth/fluidsynth's midi in 
(midi tab on qtractor/connections or alsa tab on qjackctl/connections);
5. connect qsynth/fluidsynth's audio outs to system:playback_1,2 (audio 
tab on qtractor or qjackctl/connections);
(you can do the above in any order you like, finally...)
6. hit play on qtractor...


rncbc aka. Rui Nuno Capela

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