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musicall · Post by **musicall** » Sun Jun 17, 2007 2:30 am

i have a cool little fx sound going on right now where the filter gets opened and closed based on lfo 1.....its a consistent speed or rate of cut on and off....but can i apply an envelope to the lfo so the rate of the lfo changes?

musicall · Post by **musicall** » Sun Jun 17, 2007 5:19 am

might i add that i want the rate of the lfo to gradually speed up....so the sound starts by cutting in and out slowly and then builds up to cutting in and out quickly

bmrzycki · Post by **bmrzycki** » Sun Jun 17, 2007 6:46 am

musicall wrote:i have a cool little fx sound going on right now where the filter gets opened and closed based on lfo 1.....its a consistent speed or rate of cut on and off....but can i apply an envelope to the lfo so the rate of the lfo changes?

If you look at the knobs on a given VCFx you'll see there are:

Cutoff Res ... ... KeyFol Drive

The two ... both modulate the cutoff. If you set the first one to LFO1 and the second one to modwheel you'll hear the modwheel influence the amount of LFO applied to the cutoff.

The same can be done with any modulation input source. So to do what you want, set the first to lfo, and the second to ENV2.

Another alternative is to modulate the amplitude of the lfo with ENV2. The knob to the right of the Amp knob can be used to raise/lower the amount the LFO is applied to all modulation targets.

Hope that helps.

musicall · Post by **musicall** » Sun Jun 17, 2007 5:25 pm

thank you! will try that now.

Urs · Post by **Urs** » Sun Jun 17, 2007 9:18 pm

musicall wrote:i have a cool little fx sound going on right now where the filter gets opened and closed based on lfo 1.....its a consistent speed or rate of cut on and off....but can i apply an envelope to the lfo so the rate of the lfo changes?

Which synth are you talking about?

In Zebra for instance, LFO1 has a direct modulation slot for the rate...

Urs

Howard · Post by **Howard** » Mon Jun 18, 2007 4:06 pm

bmrzycki wrote:Cutoff Res ... ... KeyFol Drive. The two ... both modulate the cutoff. If you set the first one to LFO1 and the second one to modwheel you'll hear the modwheel influence the amount of LFO applied to the cutoff.

One doesn't scale the other (like it does in the mod matrix), they add up. Besides, the question was about modulating LFO rate.

musicall · Post by **musicall** » Mon Jun 18, 2007 11:23 pm

howard what do you mean one doesnt "scale" the other?

Howard · Post by **Howard** » Tue Jun 19, 2007 9:22 am

musicall wrote:howard what do you mean one doesnt "scale" the other?

To "amplitude-modulate"...

In each of the 4 slots in the mod matrix, two modulation sources can be multiplied together. You can think of this as one of them (Via) scaling the other (Modulator). The two user-definable "..." controls you see in Zebra's filters, however, do not interact like that. They are not multiplied, but simply added together.

musicall · Post by **musicall** » Tue Jun 19, 2007 6:43 pm

hmmm interesting...not sure i fully understand, thank u for ur time tho!

Urs · Post by **Urs** » Tue Jun 19, 2007 10:01 pm

musicall wrote:hmmm interesting...not sure i fully understand, thank u for ur time tho!

Well, if you're using Zebra2, you can just assign an envelope to the LFO rate. Or, instead of the envelope, you could use one or more Modulation Mixers to create any kind of interacting modulations.

musicall · Post by **musicall** » Wed Jun 20, 2007 8:40 pm

thanks for the response urs. yes indeed im using zebra 2...im just curious to understand the whole "scaling" concept

Howard · Post by **Howard** » Wed Jun 20, 2007 10:36 pm

musicall wrote:...i'm just curious to understand the whole "scaling" concept

"Via" modulates "Modulator" in the matrix. That's all I meant by "scaling". No big "concept" there.

Urs · Post by **Urs** » Wed Jun 20, 2007 10:38 pm

musicall wrote:thanks for the response urs. yes indeed im using zebra 2...im just curious to understand the whole "scaling" concept

The scaling concept is in the Modulation Matrix (below the Grid/Module Matrix) or in the Modulation Mixers. Latter are pretty advanced/complicated, so I'll stick to the Matrix.

In the ModMatrix you can use any modulator (LFOs, Envs, Midi...) to modulate *anything* that has a knob (well, 99%). You chose a modulation source, a target and a depth/intensity. This is normal, straight forward & simple.

But apart from that you can also choose a "via depth" and a "via source". This would be a second modulation source that *scales* the amount of the actual modulation. By this you can for instance use a ModWheel (as "via source") to control the modulation depth of an envelope on i.e. filter cutoff. Like, the higher the ModWheel, the more Env2 on VCF...

It's quite simple. Just try it!

Urs

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