Staggered oscillators?

Tips and techniques for Minimoog Analog Synthesizers
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midilifestyle
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Joined: Mon Apr 01, 2013 6:27 pm

Staggered oscillators?

Post by midilifestyle » Thu Jun 05, 2014 11:59 am

Hey all,

So I'm trying to reverse engineer the "relaxation drone" factory preset.

They've got the gate open and keyboard off, with a really slow sample and hold set to stair step that triggers the gates, resulting in the chord being played repeatedly. But here's the thing: the gates trigger for each oscillator, one at a time, like slowly strumming a chord. What is doing that?

I figured out the speed of the strum is controlled by the speed of the LFO that is being stair stepped by the s&h, yes. But I don't know how to produce that lag between the oscs on my own from scratch. Any thoughts?

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MC
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Re: Staggered oscillators?

Post by MC » Thu Jun 05, 2014 2:29 pm

My guess is the mix levels are being modulated. Check the pot mappings.
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SteveD
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Re: Staggered oscillators?

Post by SteveD » Fri Jun 06, 2014 12:20 pm

Probably it's sample and hold modulating waveshape - this allows you to go to 0% pulse width at on the S+H steps that are above a certain voltage - which makes the VCO silent for that step.
One of my favorite tricks. By setting the VCOs to different amounts of pulse width (This is between ~2:00 and full CW on the wave pots) you can get some to cut out while others are still sounding.
SD

midilifestyle
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Re: Staggered oscillators?

Post by midilifestyle » Tue Jun 17, 2014 2:59 am

That's indeed what it is...some of it at least.

Still can't totally recreate that patch. But hey: inspires you to learn, no?

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