[sdiy] VCO - sine output - why bother?

[Kylee Kennedy]

I love the Sine output on the 2nd VCO of the ARP 2600, I use it all the
time. It enhances the fundamental as said before. Also sine is great for
LFO uses.

I have put that filter into self-oscillation and calibrated Silent Way to
track 1v/Oct. Makes for a fun whistling sine wave.
Then I turn the self oscillations down and keep the tracking...you can
create melodic resonant parts. Still my favorite synth.

Kylee

On Fri, Aug 26, 2016 at 1:46 PM, Quincas Moreira <quincas at gmail.com> wrote:

> Thanks all, what a great thread, I always learn so much from you guys :)
>
> On Fri, Aug 26, 2016 at 12:26 PM, David G Dixon <dixon at mail.ubc.ca> wrote:
>
>> To answer Quincas's question below:  It is relatively hard to make a sine
>> wave directly without using a self-oscillating filter or a digital
>> wavetable.  It is harder to get superior tracking in a filter than in a
>> well-designed VCO.  Also, it is pretty hard to shape a sine into anything
>> else, because it has no sharp edges or straight lines.  It is very
>> straightforward to shape triangles or saws into the other waves with
>> rectifiers and plus-minus amps, which are easy to design.
>>
>> Also, a sine shaper to get a sine with a THD of about 0.5 to 1.0% is
>> convenient and cheap.
>>
>> I have another question about the sinewave issue (btw I love my sines,
>> use them all the time, but only the filters in oscillation give me perfect
>> sines)
>> Is there not a way to make a sine core oscillator and derive the other
>> waves from it? Like a filter with fixed high resonance for the sine, a
>> comparator for the square etc...
>> Why doesn't anybody do that?
>>
>> Quincas Moreira
>>
>>
>
>
> --
> Quincas Moreira
> Test Pilot at VBrazil Modular
>
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