[sdiy] VCO - sine output - why bother?

[Roman Sowa]

So in closed architecture synth sometimes you have 2 or 3 oscillators 
and also suboscillators going to one filter that you don't want to tune 
down to fundamental then. Or if one osc can be used to modulate the 
other one - this is most wanted use of sine. Use in LFO was mentioned 
already.

Sine is not that much of a circuitry compared to total design, and one 
waveform more is good selling point.

Roman

W dniu 2016-08-26 o 11:38, Steve pisze:
>
> well not a dedicated VCF, but one that you already have in the usual
> chain. That's why it looked to me like a lot of effort for dubious gain
> - but since it is so common, there had to be a good reason, which is why
> this thread exists. :)
> Probably I'm thinking more in terms of voicecard, while the other reply
> I already got on this thread and yours are more in the realm of "modular
> and free" ;-)
> (or / and I just haven't seen enough architecture differences in typical
> fixed-topology synths, I've only seen a few, all rather similar, and
> assumed "this is how it's done")
>
> Then again, when I think in the box of "subtractive synthesis", in a
> strict sense anyway, the suggestions of using a single sine wave to add
> a fundamental after a VCF feels kinda odd :-D
> I guess users of more complex (routing wise) synths have more tricks
> like that up their sleeves, which kinda forms this idea in my mind that
> next to my imagined designs to build there needs to be more room for MUX
> ICs on the PCB...
>
> Steve
>
>
> *Von:* "Roman Sowa" <modular at go2.pl>
> if you're going that route then why do you think VCF is simpler than
> sine waveshaper, even if it uses OTA? VCF will usually take 4 OTAS.
>
> Roman
>
> W dniu 2016-08-26 o 10:30, Steve pisze:
>>
>> Now I'm not a super synth expert, also not in sound design with such.
>> What I've always wondered, if I look at VCO circuits, why people go to
>> the lenghts that they do wave-shaping a more or less pure sine as a
>> waveform output, my heart ached when I saw a circuit that used an OTA +
>> yet other stuff just for that.
>> What more does a dedicated sine output provide that one can't get with
>> using triangle -> lowpass VCF with keyboard tracking on? So maybe it
>> doesn't shave off all harmonics totally, but is the sound difference
>> really that big?
>>
>> Steve
>>
>> *Gesendet:* Freitag, 26. August 2016 um 06:42 Uhr
>> *Von:* "David G Dixon" <dixon at mail.ubc.ca>
>> *An:* "'Quincas Moreira'" <quincas at gmail.com>, "'Richie Burnett'"
>> <rburnett at richieburnett.co.uk>
>> *Cc:* "'synth-diy DIY'" <synth-diy at dropmix.xs4all.nl>
>> *Betreff:* Re: [sdiy] SAW core VCO flyback time
>> I stopped building sawcore VCOs because I didn't like flyback. That's
>> why I only build tricores now, and shape them into saws. They sound
>> better anyway, and sync in a more interesting way.
>>
>>
>> ------------------------------------------------------------------------
>> *From:* Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] *On
>> Behalf Of *Quincas Moreira
>> *Sent:* Thursday, August 25, 2016 5:41 PM
>> *To:* Richie Burnett
>> *Cc:* synth-diy DIY
>> *Subject:* Re: [sdiy] SAW core VCO flyback time
>>
>>
>> crickets....
>>
>> lol. I wish I was enough of a badass designer to be able to brag on
>> this thread ;)
>>
>>
>> Cheers
>>
>> -Quincas
>>
>> On Tue, Jul 5, 2016 at 7:10 AM, <rburnett at richieburnett.co.uk> wrote:
>>
>> What sort of reset times are people getting with their
>> sawtooth-core analogue VCO designs?
>>
>> I'm curious what figure is the current state of the art.
>>
>> -Richie,
>> _______________________________________________
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>>
>>
>>
>> --
>> Quincas Moreira
>> Test Pilot at VBrazil Modular
>>
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