[LAD] Routing signals in mixer (Ardour, Qtractor)

Louigi Verona louigi.verona at gmail.com
Thu Jul 15 12:22:55 UTC 2010


On Thu, Jul 15, 2010 at 4:16 PM, Jeremy <autostatic at gmail.com> wrote:

> Louigi Verona wrote:
>
>> Okay, last message for today.
>>
>> Eventually I could partially reproduce. If I create a stereo Vocoder track
>> FIRST, then the latter mono carrier and modifier tracks would channel into
>> Vocoder provided I press "monitor" on it. But the output is a weird mix of
>> vocoded signal and the modifier. If I change modifier and carrier places -
>> the signal does not change. Why would track creation matter I do not know.
>> Rui?
>>
>>
> The reason why you get a mixed signal could be because you use both outputs
> of the Vocoder track. The vocoder LADSPA plugin outputs the dry signal on
> the second output and the vocoded signal on the first output. That's why I
> connected the first output of the Vocoder track to both inputs of the
> Vocoder Mix track, like this you have faux-stereo and better control over
> the output of the Vocoder track.
>
>

Ah, this could be the reason. I will recheck carefully. I think I tried
routing only one but I am not sure.




>
>  Also, when Vocoder does not receive anything, it starts to generate XRUNs,
>> so if you close Qtractor while Vocoder is activated, Qtractor will freeze.
>>
>>
> The more bands you select in the vocoder LADSPA plugin, the more CPU it
> takes, so bigger chance for xruns. I didn't thoroughly test this setup yet
> so it might be something else.
>
>
>
LADSPA vocoder in JACK Rack has the same problem. Being already pretty
experienced in this regard (hehehe) I can say that this is because of an
effect which I forgot how is called when the plugin stops receiving the
signal but continues to try to process data and starts going into
calculations of really small numbers and it triggers a software part of your
CPU and it uses a lot of resources, these calculations. The developer should
find a way to fix this somehow.





> Best,
>
> Jeremy
> _______________________________________________
> Linux-audio-dev mailing list
> Linux-audio-dev at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-dev
>


Thx Jeremy )

-- 
Louigi Verona
http://www.louigiverona.ru/
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