What is Your Favourite Analog OSC Waveform and Why?

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Mooger5
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by Mooger5 » Sat Aug 01, 2009 7:45 pm

HideawayStudio wrote:
Automatic Gainsay wrote:Sawtooth-Triangular.
:)

Good one AG :) .... can you have a PWM'd sawtooth?.... I don't see any reason why not?

I had wondered about this. The hardware synths that I currently know of doing such are the Alpha Junos. I think the waveshaping part is analog.

On a side-note, I read something from Bob Moog in response to why the Mini did not have PWM. And he said in those times PWM was only used in weak oscillators to fatten up the sound: the Mini gives you fixed 50, 25 and 10% pulses (or near) so if you want movement just detune a couple of oscillators. :lol:
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by alyerpal » Sat Aug 01, 2009 7:46 pm

HideawayStudio wrote:
Automatic Gainsay wrote:Sawtooth-Triangular.
:)

Good one AG :) .... can you have a PWM'd sawtooth?.... I don't see any reason why not?

Alpha Juno does a PWM'd sawtooth...
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by HideawayStudio » Sat Aug 01, 2009 7:50 pm

alyerpal wrote:
HideawayStudio wrote:
Automatic Gainsay wrote:Sawtooth-Triangular.
:)

Good one AG :) .... can you have a PWM'd sawtooth?.... I don't see any reason why not?

Alpha Juno does a PWM'd sawtooth...
Oh heck - that will teach me not to read the manual! .... I've got an MKS-50 in the studio (Ex Howard Jones!)

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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by Christopher Winkels » Sat Aug 01, 2009 8:11 pm

Full square wave with slow PWM.

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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by garranimal » Sat Aug 01, 2009 10:09 pm

+1 Sawtooth. I still get a buzz from it.

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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by veer chasm » Sat Aug 01, 2009 11:05 pm

Has anyone said square wave yet? No? Okay, I like square waves.
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by analogholic » Sat Aug 01, 2009 11:27 pm

The sawtooth with PWM on the Chroma sounds lovely !!!

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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by Synthaholic » Sun Aug 02, 2009 1:05 am

I haven't stumbled across any real analog synths in my travels that can PWM a sawtooth, but a couple digital jobbies I have do: the D-50 and the Microkorg.
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by Automatic Gainsay » Sun Aug 02, 2009 5:27 pm

HideawayStudio wrote:
Automatic Gainsay wrote:Sawtooth-Triangular.
:)

Good one AG :) .... can you have a PWM'd sawtooth?.... I don't see any reason why not?
The Micromoog, most underappreciated of all Moogs, has a variable waveshape. Instead of selecting a set waveshape, you turn a free-turning knob which varies between waves.
It that isn't cool enough, the incredible modulation matrix allows you to modulate the waveshape, which results in a PWM-sounding effect.
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by Solderman » Sun Aug 02, 2009 5:41 pm

The Moog Voyager has this same variable waveshape. Tri-Saw is at 1.5 on the knob marking. The Multimoog has it also.
Only other VCO based synth I know that does Saw wave Width Modulation is the Akai AX-60.
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by shaft9000 » Mon Aug 03, 2009 2:14 am

the LP does it too.

btw, this thread is f**k lame
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by Mooger5 » Mon Aug 03, 2009 2:23 am

While studying the Juno 6 schematics, I just noticed VR37 labeled (sawtooth) width. This variable resistor seems common to all 6 voices! Anyone familiar with the Poly 800´s mods might find that interesting. At least maybe you could step over the calibration procedure and just tweak the waveform so that it sounds the best to your ears, either fatter or edgier, who knows? I don´t know for sure if it works or not, it´s only a crazy idea. :D
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by Black Tomorrow » Mon Aug 03, 2009 4:35 am

I guess I'm in the minority (though I'm not totally alone) but give me a square wave any day. I'd almost be willing to give up the filter, too.
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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by HideawayStudio » Mon Aug 03, 2009 12:44 pm

shaft9000 wrote:the LP does it too.

btw, this thread is f**k lame

:D I must admit it's not one of my better ones....
Last edited by HideawayStudio on Mon Aug 03, 2009 8:48 pm, edited 1 time in total.

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Re: What is Your Favourite Analog OSC Waveform and Why?

Post by steveman » Mon Aug 03, 2009 1:16 pm

Solderman wrote:The Moog Voyager has this same variable waveshape. Tri-Saw is at 1.5 on the knob marking. The Multimoog has it also.
Only other VCO based synth I know that does Saw wave Width Modulation is the Akai AX-60.
Oberheim OB-1 does.
mooger5 wrote:And it seems not all waveforms are generated equal. In my Rogue I think the pulse ones originate from clipped sines, and they´re like in figure B:
If that's true, I'd be really surprised. Much more complex curcuit to derive a sine wave and then clip it. Moog type VCOs are generally 'sawtooth core' ie. the basic waveform generated is a sawtooth, then all the other waveforms are derived from this. Easy to generate a square wave from a sawtooth, just use a comparator. For PWM just vary the comparator threshold.
Given the Rogue was the cheapest Moog they could make at the time I can't see there's any way they'd make the circuitry more complex than needed.

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