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From what I’ve gathered from my modular learnage (learning?), a bipolar lfo will go above and below a threshold (usually 0, so -1 and +1) where a unipolar will only go one direction (Either + or - instead of both)
So let’s say you’re modulating a filter cutoff that’s already open halfway. Unipolar will open it up all the way then go back to half open, where a bipolar will sweep between closed and open.
With unipolar you can set a parameter to the highest or lowest value you want and modulate only in the other direction.
Could you use the wave surgeon for that? Wouldn’t give you full range, probably, just half (with a flat section where the other part of the waveform would have been), but I think it’d make the thing just go one way or the other from zero. I was wondering if you could use the utility section to play around with the offset, too, but I’m not sure if that would work, depends if the attenuators apply an offset voltage if nothing is plugged in. It’s all a bit ”not quite but almost”, though.
I couldn't come up with any solution that worked with the wave shaper. Could be I just don't understand it enough though.
For that application, you could achieve the same thing by instead setting the filter at 75% and halving the LFO amplitude so that at its lowest point the filter hits 50%. Or whatever numbers achieve the filter oscillation that you want.
Positive or negative modulation depth. In Drambo for example if you turn the mod-dial to the left (down) or right (up).
Hmm. Turns out my suggestions don’t work according to the Ape Matrix scope plugin.
Apologies, people: as you were…
Thanks everyone, I think I can achieve what I wanted with the utility module. That said, now I'm not sure if the behavior I'm seeing is really about polarity: should
lfo 1 out → vco 1 cvjust work?Just work to do what? To modulate the vco1 pitch? If so then yes.
Yeah, I'm not seeing the expected results when LFO shape is a square (I get constant pitch with brief interruptions instead of pitch alternating between two values for the same amount of time) or saw up/down (pitch oscillates as if it was a sine/triangle LFO instead).
A square wave is almost like a gate so it turning off (interrupting) your oscillator kinda makes sense. And yes, a saw wave lfo is a lot like a sign wave but just less smooth. Like others, I’m not sure what the results are that you’re looking for.
A screenshot of your routing would probably help immensely
Don't know off the top of my head, does the LFO have Pulsewidth? If so check, if it's set to 50percent, so the positive and negative parts are equal in length.
Edit: maybe a shape parameter, that changes Pulsewidth on the square and fades from upsaw over triangle to downsaw when saw is selected.
Further thought, this time I’ve tested with a scope and I think I’m right for once (FLW). 🤣
If you loop the envelope then you get a proper unipolar LFO (you have to fiddle with rise and fall times to change frequency and shape). But… you can’t do a square wave (just triangle/saw variants), as turning on sustain just kills it stone dead, and of course you then haven’t got an envelope. Possibly you could fake it with synced LFOs to shape the VCA or filter, but it will just cycle regularly so it’s limiting rhythmically.
I think you just need to take the amplitude down. The pitch of the oscillator is just dropping down below audible range. If you patch it to
utility in 1, andutility outtoeco 1 cv, then turn down the attenuator to +20% (about 1:00) or less, you'll get the expected results.[edit] nvm. Still doesn't do what I expected. 🤷🏼♂️
That square wave isn't looking like a square wave on an oscilloscope.
This is what I'm trying
Instrument/- Init -presetI'm not saying this is a bug but I'd like to understand why it works this way.
Edited for clarity.
And here’s the triangle LFO??
I have to be doing something wrong…
Are you getting these by connecting the LFO out to the VCA? I saw that months ago but shrugged it off as maybe some sort of way to prevent DC offsets in the output, but maybe there's more to it
Yes. LFO straight to via in, echo decay all the way off. Maybe I'm using auSCOPE wrong or something.
The sin wave looks as expected, but that's the only one.
humm ... LFO outputs from miRack into auSCOPEx look as they should.
... and the effect on the vco pitch from Solderbox's LFOs sounds like the shapes I'm seeing.
'tis a mystery. 🤔
Those are some wild scope pics haha. I don’t own Solderbox so I’m not sure of it’s specific routing. And by routing lfo to the vco cv input, I’m assuming that input acts as a v/OCT input to change pitch. So in theory the pic you posted should work fine. Have you tried a separate lfo source like others mentioned to see if it’s the in-app lfos that are buggy? Shot in the dark, do you have to tweak the knob a tad to get it working kinda like the filters in Model 15?
I think we're getting a few things mixed up here because of the range of topics covered.
The oddity is with the shape of the LFOs. If you patch an LFO into the pitch of the oscillator, the effect isn't what I would expect. So, I started investigating the shape of the LFO itself by sending the LFO directly out to the vca and looked at it with an oscilloscope output. The shapes do not look like they should. Doing the same with other apps such as miRack and Ripplemaker shows the expected LFO shape.
Thanks @offbrands for the screen shots. Those confirm that when I was looking at the oscillator output, I was doing things right. Looking at the vco output on the scope in that case would show the oscillator shape. The shape would remain the same as the pitch changed, but the frequency would change. It's harder to see the time effect that way, but does work.
Based on what I'm seeing by outputting other apps LFOs to the scope in the same way, and based on the pitch not fluctuating as expected when patching the lfo into the vca pitch, I have to conclude that there's something not expected in Solderbox's LFOs.
I hate to bother @brambos, but it would be nice to understand if possible.