[sdiy] simulate detune / polyphony with a single DCO

[cheater00 cheater00]

if you really want multiple voices out of one oscillator, you should
read up on how the c64 chip tunes achieve polyphony on a single
oscillator voice (out of three they have available).

On Mon, Apr 10, 2017 at 12:34 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
>
> On 10 Apr 2017, at 07:57, Gordonjcp <gordonjcp at gjcp.net> wrote:
>
>> On Mon, Apr 10, 2017 at 12:04:35AM +0100, Tom Wiltshire wrote:
>>> Assuming I'm understanding what you're intending, I've come across a couple of similar things, although not the same;
>>>
>>> One is the DCOs with Sync on the Minod Vorga (a short-lived MIDI mono synth with several interesting features). These allowed a "Wave shape CV" to produce a Sync Bend on a single oscillator by increasing the control current to the integrator, whilst using the MCU to detect a integrator reset using a on-chip comparator as a normal VCO would. The oscillator reset could then either be triggered by the timer or the comparator, both inside the MCU. This basically gives you the effect of two oscillators with only one. The "Sync Master Osc" is sort-of hypothetical.
>>
>> Aha, so somewhat like a Juno oscillator but with the ability to free-run rather than actually needing the reset pulse from the CTC?
>
> Yes, exactly.
>
> Tom
>
>
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