[sdiy] function generators as slave oscillators

Scott Nordlund gsn10 at hotmail.com
Sun Feb 10 09:38:13 CET 2013

I made a short (and obnoxious sounding) example recording: http://www.mediafire.com/?m8nknxxtl16hnve

I'm using two function generators here; a Wavetek 145 and 188. The first part starts with just the Wavetek 145 synchronized in trig (one-shot) mode, which sounds sort of like a variable pulsewidth or filter as I change the frequency. I then switch to gate mode (0:22), which sounds like oscillator sync. Then I modulate the Wavetek 145's VCG input with the Wavetek 188 (0:50), then connect the 145's pulse output to the 188's trigger input (1:10). At this point it's some sort of sync-FM feedback loop. Finally, I activate the sweep on the 188 (1:20). Confused knob twiddling follows.

It's pretty neat considering how little I paid for them.

> Date: Fri, 8 Feb 2013 00:27:26 +0100
> From: magnus at rubidium.dyndns.org
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] function generators as slave oscillators
> On 02/07/2013 10:16 PM, Scott Nordlund wrote:
>> Has anyone tried slaving a standard function generator to a VCO or other audio signal by feeding it into the function generator's trig/gate input? I've found it to be a fantastic source of strangeness if you have a sufficiently fancy function generator. The output waveform isn't constant over pitch, so you get a sort of fixed formant filter effect, and this can be modulated using a sweep generator or VCG input. I look forward to making some weird recordings this weekend. I have two Waveteks that are capable of all sorts of nonsense.
>> Any thoughts or suggestions?
> My brain hurts. But then I realize that you can do it and it should be
> an interesting form of "distorsion" and waveshaping.
> Cheers,
> Magnus

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