[sdiy] function generators as slave oscillators

Magnus Danielson magnus at rubidium.dyndns.org
Sun Feb 10 14:18:32 CET 2013

Hi Scott,

On 02/10/2013 09:38 AM, Scott Nordlund wrote:
> 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.

As always, all tricks are good to get that timbre shifts that kinda make 
sense and sounds interesting. It's not new, but we need to recall what 
is possible, as we tend to forget what we can do outside the 
comfort-zone and pre-patched setups.


>> 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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