How to active in Qtractor the volume and pan faders with MIDI bus?

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digitsun
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How to active in Qtractor the volume and pan faders with MIDI bus?

Post by digitsun »

Maybe is an old question but I don't have a clear answer. I create a MIDI bus with a synth. Well, I play and record some notes. Beautiful.

Then I want to play with volume and pan faders (and maybe with automation) but... Qtractor don't recognize the fader of MIDI bus, What :shock: ?

I apply automation to volumen and I see the fader moves but the sound keeps load (same situation with pan)

In the official documentation I read something about that is no possible, but What is the way for achieve control volume and pan of MIDI buses?

P.S: And Why Qtractor works in that way?
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by LAM »

Hi @digitsun,
there is a workaround described here:
viewtopic.php?f=1&t=22975
viewtopic.php?t=13379

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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by digitsun »

LAM wrote: Wed Nov 24, 2021 8:01 am Hi @digitsun,
there is a workaround described here:
viewtopic.php?f=1&t=22975
viewtopic.php?t=13379
The second link is the most useful. The situation here is that I want play MIDI instruments and while I mixing move volume fader, but in Qtractor volume fader in MIDI bus doesn't do nothing, weird...

From here (viewtopic.php?t=13379):

rncbc said: you can try using a simple audio_fx plugin (eg. LADSPA) to have direct control of that audio signal like gain/volume and/or panning/stereo balance. i think this is what you call as it as a "hack" above.

So, in Qtractor Do I need to add always an audio plugin with my MIDI instrument for control the volume fader?
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by rncbc »

digitsun wrote: Wed Nov 24, 2021 8:11 am So, in Qtractor Do I need to add always an audio plugin with my MIDI instrument for control the volume fader?
not always: if the instrument plugin itself recognizes MIDI CC#7 for volume and/or MIDI CC#10 for panning, which are in fact what the MIDI track faders do send out and through the chain...

hth. cheers
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by digitsun »

Hi rui

So, if the virtual instrument responds to the fader moves in MIDI bus I don't need extra plugin. Is that right? Some volume and pan plugin recommendation
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by rncbc »

digitsun wrote: Wed Nov 24, 2021 7:58 am...
What is the way for achieve control volume and pan of MIDI buses?

P.S: And Why Qtractor works in that way?
automation is only for tracks and its control subjects (volume, pan, mute, solo, etc. and respective plugins parameters);
there's no way nor means to have automation on buses, of any kind. period. :)
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by digitsun »

rncbc wrote: Wed Nov 24, 2021 8:28 am
digitsun wrote: Wed Nov 24, 2021 7:58 am...
What is the way for achieve control volume and pan of MIDI buses?

P.S: And Why Qtractor works in that way?
automation is only for tracks and its control subjects (volume, gain, mute, solo, etc. and respective plugins parameters);
there's no way nor means to have automation on buses, of any kind. period. :)
Sorry, my mistake. I'm referring to MIDI tracks
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by rncbc »

digitsun wrote: Wed Nov 24, 2021 8:26 am So, if the virtual instrument responds to the fader moves in MIDI bus I don't need extra plugin. Is that right? Some volume and pan plugin recommendation
as said, you can only automate on tracks, buses have no automation.

for the plugin, you may look for some basic ones from LADSPA or LV2, for amplifier (volume, gain), stereo balance (which is the more technically correct name for "panning" in this context), etc.

byee
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by digitsun »

I'm studying Qtractor, its logic is simple: audio and midi are different. So, you have treat them of different ways.

For virtual instruments is possible applied automation in the level or volume know/fader (the name may change, depends of instrument). If the instrument doesn't have a volume parameter I found a simple LV2 plugin:

Gain (https://github.com/moddevices/mod-utilities)

I continue searching a plugin for panning (suggestions are welcome)
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by LAM »

digitsun wrote: Wed Nov 24, 2021 11:40 am I'm studying Qtractor, its logic is simple: audio and midi are different. So, you have treat them of different ways.

For virtual instruments is possible applied automation in the level or volume know/fader (the name may change, depends of instrument). If the instrument doesn't have a volume parameter I found a simple LV2 plugin:

Gain (https://github.com/moddevices/mod-utilities)

I continue searching a plugin for panning (suggestions are welcome)
https://github.com/unclechu/lv2-stereo-mixer

Don't know if it's overkill, but it has Gain and Pan controls.
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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by LAM »

There is also the "classic" one for Qtractor:

https://github.com/ycollet/vopa

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Re: How to active in Qtractor the volume and pan faders with MIDI bus?

Post by digitsun »

LAM wrote: Wed Nov 24, 2021 12:12 pm There is also the "classic" one for Qtractor:

https://github.com/ycollet/vopa
Wow, this app is THE key in this situation.

I searched info about vopa an I found a post of its author in the Qtractor repository, that post is a piece of history 'coz the author had the same situation of me and for a miracle he is a developer and made volpa.

Rui in the future will add a solution in Qtractor for this workflow. I think that is really necessary that Qtractor has a built-in solution for manage this situation.

Please Rui don't forget it (remember We love you).
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