varying square lfo pulse width / duty cycle

[kuniklo]

Is there any way to get square lfos of varying pulse width without the MSEG?

[Polybius]

I'm not sure if i understand you correctly, but you can modulate the rate of a square LFO with a sine wave of a second LFO, to get that bouncing ball effect.

Here's a patch i made up quickly:

http://users.pandora.be/bogaard/temp/modsquarelfo.h2p

[kuniklo]

What I want to do is adjust the duty cycle of a square wave lfo, from a full 50% to a narrower width. Ideally I'd like to be able to modulate this in realtime as well but just being able to change it would be nice.

Maybe something with two saw lfos and the mmix module would do it.

[Howard]

Do this experiment: Start from scratch with one oscillator, set LFO1 to Square, use it to modulate OSC1 Pitch in the OSC module. Then go into the mod matrix, modulate LFO1 by LFO1 (just a bit e.g. +6) via LFO2 (maximum). Adjust LFO rates.

[kuniklo]

Very clever! This recursive modulation stuff is black magic.

[zircon]

Isn't that a sort of complex way of doing simple pulse width modulation? Just take a saw osc, go to the Phase tab, invert the phase, and slap an LFO on the Phase knob. Bam, instant PWM.

[beej]

He may not be wanting oscillator PWM - he wants varying pulse width square LFO's - he might be modulating all kinds of stuff, so no, from his question, the OP is not wanted to achieve oscillator PWM, but a nice LFO effect for some other modulation target/s.

[kuniklo]

He may not be wanting oscillator PWM - he wants varying pulse width square LFO's - he might be modulating all kinds of stuff, so no, from his question, the OP is not wanted to achieve oscillator PWM, but a nice LFO effect for some other modulation target/s.

Correct. I want to change the pulse width of an lfo, not an oscillator.

[beej]

Out of interest - what are you using it for..?

[kuniklo]

Out of interest - what are you using it for..?

Nothing in particular. I was just messing around with some sound design and wanted to be able to control this. I got used to doing this with Surge where it's a built-in feature of the lfos (the deform parameter).

[mungocherry33]

I'm really serious when I say: I can't wait to be able to understand what the hell you all are talking about, as I've recently made the commitment to immerse myself into synth programming-all available methods. I find the idea of sound creation as appealing as becoming more proficient on keys and actually making music. I hope I have enough life left.

[amoeba]

wow - i gotta say the OP has a really interesting concept there - i never thought of doing such a thing. and thanks howard for the tip on how to accomplish it. all sorts of crazy applications of this are running thru my head now. thanks!

[Howard]

This recursive modulation stuff is black magic.

The trick is to think of tricks that you wouldn't think of

BTW thinking: Isn't PWM of a square LFO practically the same as rate modulation via an LFO (sine or Tri) of similar rate? Must try that... (rushes off to computer)

[Polybius]

This recursive modulation stuff is black magic.

The trick is to think of tricks that you wouldn't think of

BTW thinking: Isn't PWM of a square LFO practically the same as rate modulation via an LFO (sine or Tri) of similar rate? Must try that... (rushes off to computer)

Isn't that what i did in my patch? My brain hurts from thinking about this...i recently noticed i totally neglected the modulation options in the matrix section. I had to turn off my computer and lie down for a while when i discovered that part of Zebra 2