u-he

pettan_87 · Post by **pettan_87** » Mon Sep 03, 2012 11:13 am

Was just wondering about something (being I'm new to zebra 2, only had it for a week or so.) I came across in the zebra user guide. it says (pg. 51, LFO):

"This module is called a polyphonic LFO because it's instantiated per voice - every note you play can have a different amplitude, phase and rate".

Exactly how do I get the LFO to have a different, let's say, rate for every voice in Zebra? Can't find a modulation routing that makes sense to me, doing this.
does anyone know

Bronto Scorpio · Post by **Bronto Scorpio** » Mon Sep 03, 2012 11:31 am

One way would be to route a ModMapper in alternate mode to the LFO rate.
You'll have to do this in the Mod Matrix since it's somehow not possible to choose the ModMappers as modulation source directly in the LFO module.

I quickly made an example preset. You can download it here (you may have to use right click -> save target as)

Another way would be to choose an LFO in random hold mode with an extremely slow rate instead of a ModMapper as the modulation source.
The LFO will basically generate a random value each time you press a key.

You can download an example preset here.

Howard just wanted to make clear that the LFOs are polyphonic in the manual by the way. This means that the modulation of the rate etc. is calculated per voice, which therefore makes it possible to have different rates per voice etc.
The GLFOs on the other hand are only calculated once. If you change their rate it will change on all voices at once. Modulations via velocity will therefore have a different effect on LFOs and GLFOs for example.

I hope this helps!

Cheers
Dennis

Howard · Post by **Howard** » Mon Sep 03, 2012 2:01 pm

Nicely explained, Dennis

Bronto Scorpio · Post by **Bronto Scorpio** » Mon Sep 03, 2012 6:37 pm

Howard wrote:Nicely explained, Dennis

I hope so!

And thanks!

Cheers
Dennis

trance_lucent · Post by **trance_lucent** » Tue Sep 04, 2012 5:32 am

I already proposed some additional modulators: there could be several "random" (and may be "random uni") GUIless modulators generating random value (-1...+1) on each "note on". So you can set LFO rate modulator to "random1" and adjust its modulation strength. And you can reserve LFOs and ModMappers for bigger things than just random value generating.

pettan_87 · Post by **pettan_87** » Tue Sep 04, 2012 6:31 am

Aha, Tried both modmapper and LFO as suggested by Dennis, and with a bit of tweaking I defenitely got different speeds for each note. wasn't able to load your presets btw, they wouldn't show up in the browser

but I figured it out based on what you wrote.

It also makes sense using a random value generator for LFO speed as suggested by trance_lucent, haven't checked that out yet but will ASAP.

I tried this whole differing LFO speed thing on another synth I have, which has separate voice and unison dials and where I put both unison and voice to 2, i.e. 2 voices for the same note and got 2 differing lfo speeds by just pressing 1 note, as far as i understand, this is not possible with zebra 2, being that it doesn't have a separate unison dial (as far as I know)and therefore;
1 voice=1 pressed note.
Please correct me if I'm wrong

It's not that I necessarily have to achieve this but as of now I'm just trying to understand how voices/unison are implemented in Zebra compared to other synths I've used. The zebra user guide wasn't the first piece of documentation I've read that mentions the use of different values (whatever you choose to modulate) for each voice and so I just wanted to see (Hear?) what the fuzz was about I guess. Used Lfo speed as an example since I figured it would be easy to hear that effect.

The Zebra user guide does state that the GLFO's are different btw.

Thanks for replies!

Howard · Post by **Howard** » Tue Sep 04, 2012 7:52 am

pettan_87 wrote:...this is not possible with zebra 2...Please correct me if I'm wrong

I often thought that, but almost always managed to prove myself wrong!

pdxindy · Post by **pdxindy** » Tue Sep 04, 2012 9:09 am

pettan_87 wrote:
I tried this whole differing LFO speed thing on another synth I have, which has separate voice and unison dials and where I put both unison and voice to 2, i.e. 2 voices for the same note and got 2 differing lfo speeds by just pressing 1 note, as far as i understand, this is not possible with zebra 2, being that it doesn't have a separate unison dial (as far as I know)and therefore;
1 voice=1 pressed note.
Please correct me if I'm wrong

Zebra does not have unison... but you can use 2 different osc's in 2 channels (each with their own filter if desired)... then you can use a separate lfo on each and use a separate modmapper for each... basically, you create unison manually

then you can have differing lfo speeds with 1 note...

clumsy, but it works... it's a snap in Diva

trance_lucent · Post by **trance_lucent** » Tue Sep 04, 2012 1:22 pm

pettan_87 wrote: It also makes sense using a random value generator for LFO speed as suggested by trance_lucent, haven't checked that out yet but will ASAP.

Just in case to make it clear: I meant "random" modulator as one of modulation sources, not the feature of only LFO. It would be handy not only for LFO, but for many other modules.

Howard · Post by **Howard** » Tue Sep 04, 2012 2:20 pm

trance_lucent wrote:Just in case to make it clear: I meant "random" modulator as one of modulation sources, not the feature of only LFO. It would be handy not only for LFO, but for many other modules.

Workaround: Set an LFO to "Random Hold", Sync to "Gate" and Rate to minimum. Alternatively, use a Triangle with Sync set to "Free" and minimum Rate.

pdxindy · Post by **pdxindy** » Tue Sep 04, 2012 4:08 pm

trance_lucent wrote:
pettan_87 wrote: It also makes sense using a random value generator for LFO speed as suggested by trance_lucent, haven't checked that out yet but will ASAP.
Just in case to make it clear: I meant "random" modulator as one of modulation sources, not the feature of only LFO. It would be handy not only for LFO, but for many other modules.

agreed... Diva has this and it is very easy... my question with the random in Diva is, if I add random to 3 different parameters, are they each getting a separate random or the same one?

Howard · Post by **Howard** » Tue Sep 04, 2012 8:31 pm

pdxindy wrote:my question with the random in Diva is, if I add random to 3 different parameters, are they each getting a separate random or the same one?

Easy enough to test yourself - one of the oscillator models offers split pitch modulation...

pdxindy · Post by **pdxindy** » Tue Sep 04, 2012 8:54 pm

Howard wrote:
pdxindy wrote:my question with the random in Diva is, if I add random to 3 different parameters, are they each getting a separate random or the same one?
Easy enough to test yourself - one of the oscillator models offers split pitch modulation...

aha... thanks... it is one random...

trance_lucent · Post by **trance_lucent** » Wed Sep 05, 2012 5:39 am

Howard wrote:Workaround: Set an LFO to "Random Hold", Sync to "Gate" and Rate to minimum. Alternatively, use a Triangle with Sync set to "Free" and minimum Rate.

Yes, and there is also ModMapper-based workaround. But, as I wrote, it would be better to use LFOs and ModMappers for greater things than just note-on random number generator. And a bunch of GUIless "RandomN" modulation sources (and may be "UniRandomN") generating new values at "note on" would be very handy.

u-he

KVR Audio

Zebra 2 - Differing LFO speed for each voice?