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gentleclockdivider · Post by **gentleclockdivider** » Tue Dec 22, 2020 11:24 am

The sh101 and pro 1 saw + square gives that really distinct waveform , saw +square ( low first , then high )
In zebra this can be achieved by osc 1 (upward saw ) + another upward saw ( enable pwm , ) and both osc's set to reset (phase locked ) .
Like this

The problem is when modulating the pulse width of the square waveform , it should normally give us this kind of waveform ( picture = saw + pulse width modulated square )

, but zebra gives a slightly altered version .

I wonder why this , because in isolation the pulse width behaves the same as the pro1 , sh 101
I could of course just draw a square wave in geomorph mode and use the osc symmetry effect ,but I dislike the quality of it ( even when resolution slider is fully up )

gentleclockdivider · Post by **gentleclockdivider** » Wed Dec 23, 2020 3:52 am

No one ?

poopinpants · Post by **poopinpants** » Wed Dec 23, 2020 5:18 am

use osc module preset Pulse Table instead and do not use PWM use the Wave knob to do the pulse width modulating and of course making sure both osc are reset phase retrigger it will get you that same result as the first waveform you show

gentleclockdivider · Post by **gentleclockdivider** » Wed Dec 23, 2020 10:10 am

I have no problem getting the first picture , but only when applying pulse width modulation it's different ( using PWM switch on an upward saw ) , when static it's perfect .

I am aware that I can animate the table or use a symmetry effect to get the desired result when modulating pw , but these are always dependent on osc .resolution
Still wondering why the first method does not give the desired result ( when modulated )

Urs · Post by **Urs** » Wed Dec 23, 2020 11:32 am

PWM in Zebra is done with the inverted saw method. Often the PW parameter only moves one sawtooth's phase. This creates a vibrato effect (pitch modulation) with a fast enough LFO. I found it was a smart thing to move both sawtooths in opposite direction to prevent a vibrato effect from happening.

gentleclockdivider · Post by **gentleclockdivider** » Wed Dec 23, 2020 11:47 am

Urs , This is not about fast modulation but also just applying an envelope to pwm ( inverted saw method ) .
When combined with anthother saw( see verry first post ) to get the typical 101 /juno saw + square it behaves .
Unless you mean envelope modulation is also fast modulation

Urs · Post by **Urs** » Wed Dec 23, 2020 12:53 pm

Well, I just think that maybe the bidirectional phase offset is what you're seeing (I'm not sure though, and caught up in other stuff atm...)

poopinpants · Post by **poopinpants** » Wed Dec 23, 2020 3:23 pm

gentleclockdivider wrote: Wed Dec 23, 2020 10:10 am I have no problem getting the first picture , but only when applying pulse width modulation it's different ( using PWM switch on an upward saw ) , when static it's perfect .

I am aware that I can animate the table or use a symmetry effect to get the desired result when modulating pw , but these are always dependent on osc .resolution
Still wondering why the first method does not give the desired result ( when modulated )

Trust me do what I said and you will see the right modulation happen like in the second picture from your first posting in this topic

poopinpants · Post by **poopinpants** » Wed Dec 23, 2020 5:34 pm

Another way is to making the both oscillators modulate phase together only one is PWM and the other is no PWM like this

https://imgur.com/a/6EkYbJh

Both method I post will have a desired result you posted though!!

gentleclockdivider · Post by **gentleclockdivider** » Thu Dec 24, 2020 1:00 pm

@ poopinpants
I think you misunderstood what I am trying to achieve
I know I can achieve the desired result by scanning a square/pulse wavetable but that is not the method I want to use .
I don't want to usewavetables at all , just a pure saw A + saw B pwm enabled .
Saw a =pure saw
Saw B = square wave
Both resetted and summed gives the desired result , but when modulating Saw B PWM ( this is the square remember ) , it's off
I think urs expanation is the reason for this

poopinpants · Post by **poopinpants** » Thu Dec 24, 2020 2:29 pm

Friend did you try the second method I showed, it is inspired by urs explains above and it meets your criteria you just describe to me

poopinpants · Post by **poopinpants** » Thu Dec 24, 2020 2:31 pm

gentleclockdivider wrote: Thu Dec 24, 2020 1:00 pm @ poopinpants
I think you misunderstood what I am trying to achieve
I know I can achieve the desired result by scanning a square/pulse wavetable but that is not the method I want to use .
I don't want to usewavetables at all , just a pure saw A + saw B pwm enabled .
Saw a =pure saw
Saw B = square wave
Both resetted and summed gives the desired result , but when modulating Saw B PWM ( this is the square remember ) , it's off
I think urs expanation is the reason for this

Second method I post do not use a wavetable scan please see and try

u-he

KVR Audio

SH101 style saw + square