Re: [Qtractor-devel] Can't get more than 1 LinuxSampler track to work in Qtractor

[Frank N. <bea...@we...>]

Hi Rui and all,

> > not sure who is at fault here (likely me :-), but maybe some from the Qtractor
> > community can help..I am trying to set up a simple session with Qtractor and
> > LinuxSampler: 2 MIDI tracks, each holding an instance of LinuxSampler (LV2) as a
> > plugin. When I attempt to load an .sfz file into the 2nd instance, I get an error message:
> > 
> > The audio output device 'Plugin' cannot be dropped from this sampler channel!
> > The MIDI input port 'Plugin' cannot be altered on this sampler channel!
> > 
> > Let me describe what I am doing, step by step:
> > 
> > - Start QJackctl, start JACK, start Qtractor
> > - Qtractor: Create new track, type MIDI, add plugin -> LV2 -> LinuxSampler, confirm with ok
> > - Start QSampler, click on that track, "Setup channel", select SFZ engine and some .sfz file, confirm with ok
> >   MIDI Input Type is "Plugin", Device: MIDI Plugin Device 0
> >   Audio Output Type is "Plugin", Device: Audio Plugin Device 0
> > - Qtractor: Connect MIDI keyboard to Qtractor, play into that track 
> > 
> > = all fine so far =
> > 
> > - Qtractor: Create another track, again type MIDI, add plugin -> LV2 -> LinuxSampler, confirm with ok
> > - In QSampler, click on that track, "Setup channel", select SFZ engine and some other .sfz file, confirm with ok
> >   -> at this point QSampler says "Channel 1  Some channel settings could not be set.  Sorry."
> >      and in Qtractor's console I see:
> >      Starting disk thread...OK
> >      EQ support: no
> >      Stopping disk thread...OK
> >      Starting disk thread...OK
> >      EQ support: no
> >      The audio output device 'Plugin' cannot be dropped from this sampler channel!
> >      The MIDI input port 'Plugin' cannot be altered on this sampler channel!
> > 
> >      though it then continues to say:
> >      ...
> >      Instantiating LADSPA effect 'triplePara'.
> >      LADSPA effect 'triplePara' activated.
> >      Scheduling '/tmp/x/wa_synth_drums/drum kits/sfz/z_all percussion dissonant hits.sfz' (Index=0) to be loaded in background (if not loaded yet).
> >      Loading sfz file '/tmp/x/wa_synth_drums/drum kits/sfz/z_all percussion dissonant hits.sfz'...OK
> >      Loading sfz instrument ('/tmp/x/wa_synth_drums/drum kits/sfz/z_all percussion dissonant hits.sfz',0)...OK
> >      Caching initial samples...OK
> > 
> > Net effect is still that on this new track no audio is being played out. The
> > first track continues to work fine.
> > 
> > Used versions:
> > - Qtractor 0.8.0 (built from Git on Dec 6th)
> > - libgig, liblscp, linuxsampler, qsampler built from today's svn state
> > 
> > Have I misunderstood something about how tracks and channels of Linuxsampler
> > are supposed to work from within Qtractor? Do I need to change something in
> > Qsampler before confirming the properties of a new channel?
> > 
> 
> you probably missed the little secret part that MIDI channel numbers
> must match each other, between qtractor MIDI tracks and corresponding
> linuxsampler sampler channels.
> 
> from the above you say nothing about which MIDI channel you set up the
> second linuxsampler channel, which by default gets to MIDI channel 1
> while a second MIDI track in qtractor, most probably, gets to number 2.

Oops, sorry for not stating that info. Yes, you are right, I used the "default"
in LinuxSampler/qsampler which is channel 1. However, even if I change it to the
same channel number (2 in this case) of the corresponding Qtractor track, the error
is still there:

22:21:46.876 Channel 1 setup...
22:22:21.677 Channel 1 lscp_set_channel_audio_device: The audio output device 'Plugin' cannot be dropped from this sampler channel! (errno=100)
22:22:21.682 Channel 1 lscp_set_channel_midi_device: The MIDI input port 'Plugin' cannot be altered on this sampler channel! (errno=100)
22:22:21.686 Channel 1 MIDI port: 0.
22:22:21.688 Channel 1 MIDI channel: 1.
22:22:21.746 Channel 1 Engine: SFZ.

What's a little irritating is that above it still says "MIDI channel: 1." but I
guess Qsampler/LinuxSampler is starting to count from 0 since channel 3 would
appear as "2" there.

However, still no luck so far :-\. Does this kind of setup work for you?

Thanks,
Frank