24 Apr
2010
24 Apr
'10
5:04 p.m.
Hi all!
I'm trying to control plugins in ingen using a Korg Nanokontrol, and I
think I'm missing something.
For starters, I tried a simple amplifier. So, I added a controller and
connected its output to the amplifier's gain. Moving a slider, I see the
"Controller" display change from 0 to 127. The other controls are set
to: Logarithmic: off, Minimum: 0.0, Maximum: 1.0. At first I though
nothing was happening, but then I noticed that when the slider is moved
all the way down (actually, to 2), the amplifier's gain is set to 0.0157
and then stays there. Can anyone explain what's going on?
Thanks!
Alexandros
24 Apr
24 Apr
5:20 p.m.
Hi Alexandros,
On Sat, 24 Apr 2010, Alexandros Diamantidis wrote:
I'm trying to control plugins in ingen using a
Korg Nanokontrol, and I
think I'm missing something.
For starters, I tried a simple amplifier. So, I added a controller and
connected its output to the amplifier's gain. Moving a slider, I see the
"Controller" display change from 0 to 127. The other controls are set
When you say "moving a slider" -- is this a slider on the
Nanokontrol or in the GUI? If NanoK, how did you set up the
MIDI with Ingen?
Also... which amplifier plugin did you use? Did you try a
different one?
to: Logarithmic: off, Minimum: 0.0, Maximum: 1.0. At
first I though
nothing was happening, but then I noticed that when the slider is moved
all the way down (actually, to 2), the amplifier's gain is set to 0.0157
and then stays there. Can anyone explain what's going on?
Well, 2.0/127.0 = 0.0157... so that part makes sense. (Fyi,
this is -18 dB.)
Not sure why it stays there. Your chain (I think) is NanoK
-> MIDI -> Ingen -> Plugin. Need to figure out where in the
chain the message is getting dropped.
-gabriel
6:08 p.m.
* Gabriel M. Beddingfield [2010-04-24 14:20]:
When you say "moving a slider" -- is this a
slider on the
Nanokontrol or in the GUI? If NanoK, how did you set up the
MIDI with Ingen?
Right, a slider on the NanoK. I right-clicked on the controller and
selected "Learn" to associate it with a physical slider. But now I see
the problem: the "Controller" object wasn't necessary - all I had to do
was to click "Learn" on the gain display itself, and voila! Now it works
fine. Well, it happens every time: as soon as you post about a problem,
you find the solution ;-)
I understand now what the Controller object is for: it converts control
data to audio data, right? I suppose it got stuck on 0.0157 before
(thanks for pointing out where that came from!) because of the
mismatched port types: I had connected the Controller's audio type
output to the Gain control input.
Thanks!
Alexandros
6:43 p.m.
On Sat, 24 Apr 2010, Alexandros Diamantidis wrote:
fine. Well, it happens every time: as soon as you post
about a problem,
you find the solution ;-)
Works for me! Usually, the more baseless accusations and
condescending remarks you make... the faster you realize the
obvious thing that you overlooked. If you do it right, you
realize the solution about 62 ms after hitting SEND. The
downside is you'll look like a complete @$$. :-)
I understand now what the Controller object is for: it
converts control
data to audio data, right? I suppose it got stuck on 0.0157 before
I don't think it's control data -> audio data. But I can't
really figure out what it is. My guess is that it's an
analog-style "control voltage" signal... like what you use
to connect things in Alsa Modular Synth. But that's just a
guess.
-gabriel
25 Apr
25 Apr
4:26 a.m.
* Gabriel M. Beddingfield [2010-04-24 15:43]:
I don't think it's control data -> audio
data. But I can't
really figure out what it is. My guess is that it's an
analog-style "control voltage" signal... like what you use
to connect things in Alsa Modular Synth. But that's just a
guess.
Yeah, I guess that's how you use it in an actual modular synth in Ingen
(which I haven't done yet - for now I'm using it as a simple plugin
host). But there is no functional difference beween "control voltage"
signals and "audio" signals, right? Both use the same type of ports. The
difference is what you connect them to.
Alexandros
9:58 a.m.
On Sun, 25 Apr 2010, Alexandros Diamantidis wrote:
* Gabriel M. Beddingfield [2010-04-24 15:43]:
After digging in the code, looks like I was wrong. The
'Control Port' in ingen is:
http://lv2plug.in/ns/lv2core#ControlPort
Which is described as:
:ControlPort a rdfs:Class ;
rdfs:label "Control port" ;
rdfs:subClassOf :Port ;
rdfs:comment """
Ports of this type will be connected to a pointer to a
single value conforming
to the 32bit IEEE-754 floating point specification.
""" .
I.e. it is /not/ an array/stream of values but instead a
single control value (like a global variable).
HTH,
Gabriel
I don't think it's control data ->
audio data. But I can't
really figure out what it is. My guess is that it's an
analog-style "control voltage" signal... like what you use
to connect things in Alsa Modular Synth. But that's just a
guess.
Yeah, I guess that's how you use it in an actual modular synth in Ingen
(which I haven't done yet - for now I'm using it as a simple plugin
host). But there is no functional difference beween "control voltage"
signals and "audio" signals, right? Both use the same type of ports. The
difference is what you connect them to.
5327
days inactive
5328
days old
linux-audio-user@lists.linuxaudio.org
5 comments
2 participants
participants (2)
-
Alexandros Diamantidis -
Gabriel M. Beddingfield