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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Extraction of values
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ThreeFingersOfLove



Joined: Oct 21, 2004
Posts: 162
Location: Greece
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PostPosted: Tue Oct 26, 2004 1:58 am    Post subject: Extraction of values Reply with quote  Mark this post and the followings unread

Hmm,

for quite some time, I have been struggling to extract a value from a module. And I mean any value, other than its output. For instance, you can patch the output of say, a sequncer to a compare module which means that the current value of the sequencer is compared against a fixed value and you get a logic signal carrying the result of the comparison.

Now...the signal from a filter is obviously a "composite" signal containg the current cutoff, current resonance, current key-tracking and so on. None of these paramteres is available in its own. How do I monitor for instance the cutoff frequency or resonance per se and trigger some other events when their values (and not the output of the filter as a whole) meets some criteria? scratch That would be easy if the parameters had outputs themselves, but they don't. I feel that there must be a way for parameters that have dedicated inputs but I am not sure about others.

Anyone?
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jksuperstar



Joined: Aug 20, 2004
Posts: 2483
Location: Denver
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PostPosted: Tue Oct 26, 2004 7:43 am    Post subject: Reply with quote  Mark this post and the followings unread

MIDI is your friend! This is described in the manual where it covers the use of the CtrlSend MIDI module in the Module Reference. See the attachment for example. Notice the MIDI CC assigned to the Filter Cutoff...it is the same as the CtrlSend module (CC#20), and MIDI channel is set to "This".


MIDIknob.pch2
 Description:
Example use of MIDI CtrlSend module to control a knob.

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ThreeFingersOfLove



Joined: Oct 21, 2004
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PostPosted: Wed Oct 27, 2004 1:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey jksuperstar,

thanx for the patch. Smile It is certainly helpful but it doesn't do what I'd like.

Take a look at the attached patch. An LFO sweeps the cutoff frequency of the filter. What I'd like to do is to trigger the sequencer when the cutoff reaches 110 Hz. Any ideas?

Yannis


ExtractionProblem.pch2
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egw



Joined: Feb 01, 2003
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PostPosted: Wed Oct 27, 2004 6:44 am    Post subject: Reply with quote  Mark this post and the followings unread

It would be easy if your mod amount on the filter was at full value, right?
Then you could trigger it from the LFO signal. (i.e. when the control signal reaches 36)
So, send your LFO through a modamt module with depth set to 61. Then you can trigger off the output of that.
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cappy2112



Joined: Dec 24, 2004
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PostPosted: Sat Apr 30, 2005 1:37 am    Post subject: Reply with quote  Mark this post and the followings unread

jksuperstar wrote:
MIDI is your friend! This is described in the manual where it covers the use of the CtrlSend MIDI module in the Module Reference. See the attachment for example. Notice the MIDI CC assigned to the Filter Cutoff...it is the same as the CtrlSend module (CC#20), and MIDI channel is set to "This".


I don't undestand your patch. I can get the filter cutoff in this patch to respond to CC20, without using the CtrlSend, so what is the purpose of the Ctrl Send in this patch ?
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jksuperstar



Joined: Aug 20, 2004
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PostPosted: Sat Apr 30, 2005 7:41 am    Post subject: Reply with quote  Mark this post and the followings unread

It's a loopback control. Some knobs on modules have no modulation input. So, in an instance where you'd want to use an LFO to control a knob, you send the LFO out on a MIDI CC, then assign the knob to the same CC value. This is also very effective when you have all of your sequencers in one slot, with sounds generated in another slot.

I thought the initial problem was trying to find the value of a knob (on a filter). So you could either put the control elsewhere, where you have access to the controlling signal, then MIDI it over to the knob for control.

You could also use a CtrlRecv assigned to the same value as the knob. But this doesn't help you when using a modulator like an LFO on the knob.
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