[sdiy] Chris Synths polysynth

[Martin Klang]

Ah that explains the big slew. It's a very annoying thing about the 
KeyStep that the CV output only settles some 6-8mS after the gate. IMO 
they should have delayed the gate to coincide with the CV.

For many things, like controlling an analog synth directly, it doesn't 
make a lot of difference since a few mS of frequency slew isn't audible 
(to my ears). But if, say, you are making a CV to MIDI converter and 
want it to be compatible with what's probably the most popular CV 
keyboard on the market, then you have to add your own delay, and latency.

And yes I know, you could just use the MIDI output of the KeyStep 
directly, but that's not the point!

Thank you Vladimir for this nugget of information -


Martin


On 22/10/2021 12:15, Vladimir Pantelic via Synth-diy wrote:
> Arturia uses a dual PWM scheme in all of the their Keystep and 
> Beatstep products, basically following the circuit laid out here:
>
> http://www.openmusiclabs.com/learning/digital/pwm-dac/dual-pwm-circuits/index.html 
>
>
> it works nicely, BUT also introduces a >4ms slew on all CV outputs, no 
> biggie if driving an analog synth and it gets hidden in the attack, 
> but a real nuisance if it gets sampled by a digital module...
>