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Key tracker: possible to trigger note off?


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#1 boonier

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Posted 12 February 2017 - 17:45

I need to trigger a LFO reset on note off, is it possible with the key tracker, or combination of meta devices?

 

cheers



#2 danoise

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Posted 12 February 2017 - 18:58

I don't think there's a way to directly track a note-off - definitely a nice idea for the key-tracker. 

 

But I can think of a workaround: you could always sequence a "dummy instrument" and track that as well. So every time you need the LFO to do something, enter a dummy note. If you need both note-on/note-off tracking, you could combine their signals using a meta-mixer which in turn is connected to the LFO device. 

 

That approach will work fine when composing, although for realtime/live playback it won't help you so much. 


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#3 boonier

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Posted 14 February 2017 - 10:42

That's a good work around, true.

 

Fyi I was looking to setup pseudo modulation in the sampler effects lane - to create a series modulation chain - by mimicking an ADSR env with two custom lfos, so that when the key was released, I could trigger the 'release' lfo that controlled the cutoff for an end chain filter. I would have to do this polyphonically for each sample, i.e. have a chain dedicated for each sample, which would get quite expensive quickly.

 

To be honest I think it's not such a problem to just use one LFO in one shot mode for now. Hopefully we have something like sample groups in the pipeline that will do this quite neatly ;)



#4 danoise

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Posted 14 February 2017 - 20:12

 I would have to do this polyphonically for each sample, i.e. have a chain dedicated for each sample, which would get quite expensive quickly.

 

Yes, but not *that* expensive. Renoise DSPs are pretty light on the CPU. It's an interesting idea, but I'm not sure how to make each sample *actually* process independently. 

 

For example, imagine the simple case where you hit the same note multiple times? The only way I could see this triggering the same sample would be by cycling through a bunch of stacked samples. Even then, as you cycle through them, with a bit of a release stage, the first one might still be playing as you've gone full circle (cycle?). Perhaps useful in very specific cases but otherwise not. 

 

Still, I often use both polyphonic modulation and monophonic sample effects in my instruments. And I think regular effects are great - they often do a better job at encapsulating, framing the sound somehow...


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#5 pat

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Posted 24 December 2017 - 11:26

I was just trying to do this same thing, and came across this thread. I figured out something with the signal follower to do what I want. I don't know if it will help you or not, because maybe you're trying to trigger it on a specific note off. Me, I'm just trying to toggle an LFO – enable the LFO while the note is on, and disable it when it's off. I haven't seen this technique before. Here's what I did:

  1. Make a "trigger" sample – use "create sample", set the length to 1, and draw something above the line. Set it to loop forward
  2. Add a Signal Follower with Attack / Release / Sensitivity to 0, and route it to the LFO's Active / Bypassed
  3. Add a "mute" Gainer to the end of this chain, setting gain to -Inf
  4. Route the "trigger" sample through this chain

The trigger sample now acts as a toggle for the LFO.

 

I've attached an example project that shows this technique. It sets up two triggered filter envelopes in a single instrument. That's something that I've wanted to do for a long time, have a sample-based instrument with multiple key-based filter envelopes.

 

Attached File  signal-follower-toggle.xrns   179.47KB   11 downloads

 

I am definitely going to explore this technique more. I wanted to see Renoise's limit with number of samples and chains. I added over 300 of each before giving up. If you reserve a single octave for trigger samples, you can have 1524 triggers!!! (12 notes * 127 velocity levels)


Edited by pat, 24 December 2017 - 11:38.