fast osc pitch modulation by lfo ;;;zebra filters out the harmonics:sidebands

[gentleclockdivider]

Ok .;;so when we modulate the osc;pitch by an lfo at verry high speed...at very high speed settings there seems to be a filtering going on on the high freq's ..;I mean that there are not so many added harmonics/sidebands..is this because the lfo's and/or osc's are band limited ?
I am not talking about the fm osc's ;;just the regular pitch modulation

Instead I have to use the xmf filter in self osc .;and modulate it by an osc trough fm .input .

[Polybius]

Ok .;;so when we modulate the osc;pitch by an lfo at verry high speed...at very high speed settings there seems to be a filtering going on on the high freq's ..;I mean that there are not so many added harmonics/sidebands..is this because the lfo's and/or osc's are band limited ?
I am not talking about the fm osc's ;;just the regular pitch modulation

Instead I have to use the xmf filter in self osc .;and modulate it by an osc trough fm .input .

I'm just pulling this from the top of my head, so don't shoot me if i'm wrong

But have you tried fiddling with the resolution knob in the oscillator section? I remember reading in the manual (which Howard did an excellent job of putting together) that this knob affects the sound when the pitch changes at higher frequencies when modulated by an LFO. Try it our and let us know your findings!

[Sendy]

AFAIK (and I might be wrong, but I've examined this a fair bit), the Resolution control for each oscillator ONLY affects how frequently the wavetable and subsequent Osc FX are updated and crossfaded between. It's best to think of it as the update rate for the "waveform buffer" or something like that. Everything beyond that such as pitch, volume or filtering would probably depend on the control rate of Zebra?

Also, spectroblend mode only supports 127 harmonics, so in wild pitch mods, you're going to hear some serious bandlimiting (especially low notes).

[gentleclockdivider]

yep that's what I thought ..still I think it's a pitty we can't do really fast pitch modulation on the regular osc's , well we can do fast modulation but without the added higher harmonics .
Like I said modulating xmf filter by an osc does the job , but there we only have the sine as a carrier ( selfoscilating filter )
Could you look into this urs ?

[gentleclockdivider]

yep that's what I thought ..still I think it's a pitty we can't do really fast pitch modulation on the regular osc's , well we can do fast modulation but without the added higher harmonics .
Like I said modulating xmf filter by an osc does the job , but there we only have the sine as a carrier ( selfoscilating filter )
Could you look into this urs ?

I am not talking about the resolution control , I know that this control is affecting the speed of interpolation between waves , I am just talking about regular pitch modulation , without interpolating between wav windows

[bmrzycki]

For what it's worth, have you tried changing the "speed" parameter on the LFOs? I know Urs tweaked the LFO response rate since 2.1. Maybe one of those modes can get you the desired effect you're after.

[3ee]

AFAIK (and I might be wrong, but I've examined this a fair bit), the Resolution control for each oscillator ONLY affects how frequently the wavetable and subsequent Osc FX are updated and crossfaded between.

Apparently it affects the whole OSC module.

With low resolution setting one can experience filtery pitch glides, even (temporary) aliasing + fast modulations (such as really short envelopes) aren't picked up anymore or loose their charm badly.

[Howard]

For what it's worth, have you tried changing the "speed" parameter on the LFOs? I know Urs tweaked the LFO response rate since 2.1. Maybe one of those modes can get you the desired effect you're after.

(Brian beat me to it) Yes, you should try that.

[gentleclockdivider]

For what it's worth, have you tried changing the "speed" parameter on the LFOs? I know Urs tweaked the LFO response rate since 2.1. Maybe one of those modes can get you the desired effect you're after.

(Brian beat me to it) Yes, you should try that.

Really does no one here notices it ., the fact that high speed pitch modulation filters out high frequencies , just do the same on microtonic or any other vst that is capable of high speed lfo ...zebra just doesn't add those harmonices when using an fast lfo , the result is a muffled sound
yes I have tried the different speed settings and resolution slider ..no dice

[Howard]

yes I have tried the different speed settings and resolution slider ..no dice

Sorry, Brian actually meant the LFO "Slew" setting. (BTW what do you mean by "resolution slider"?)

[bmrzycki]

yes I have tried the different speed settings and resolution slider ..no dice

Sorry, Brian actually meant the LFO "Slew" setting. (BTW what do you mean by "resolution slider"?)

Howard, sorry yes -- I was going by memory. Here's a screenshot of the component I meant:

[xh3rv]

Really does no one here notices it ., the fact that high speed pitch modulation filters out high frequencies , just do the same on microtonic or any other vst that is capable of high speed lfo ...zebra just doesn't add those harmonices when using an fast lfo , the result is a muffled sound
yes I have tried the different speed settings and resolution slider ..no dice

Are we talking about audio-rate modulation? MicroTonic is audio-rate modulation (well, up to 2khz limit of it's pitch mod knob), dunno if everyone's on the same page here. I think we'd all agree trying to use Zebra's LFOs at too fast of a rate will cause alias artifacts - [e] it is possible to dial them this fast, at the lower range of audible frequencies (so, I think it's correct to say the problem isn't bandlimiting but not bandlimiting? Although reasoning may suggest bandlimiting is not the solution either).

If this is where we're at, slew rates can limit artifacts but can't ultimately achieve the same effect as audio-rate modulation.

I don't know anything about the future of Zebra, I can say ACE / Bazille are both exceptional environments for audio-rate modulation - robust and with modular flexibility.