[sdiy] DOTCOM Analog Sequencer.. next project startup..

[Chromatest J. Pantsmaker]

I think you'd want your processor to implement some sort of "speed
multiplication" for your rotary encoder(s).  If you're at C0 and you want
it to be C8, that could take a while to get there (assuming that going
below C0 doesn't wrap around to C8)  Either the faster you turn it, the
more values it skips, or maybe having a "shift" button that would put the
encoder into 5x range or something.

I don't understand what you mean by "change any CV 'on the fly' when
playing a sequence".  Would not selecting a step via a button and turning
the (single) encoder fit this?  Or do you mean to change any step from an
external CV?

Surely, the MCU would generate the CV 'on the fly' no matter if the note
was set via analog pots, a bank of encoders, or a single directable encoder.

On Fri, Jul 24, 2020 at 6:50 AM Jean-Pierre Desrochers <jpdesroc at oricom.ca>
wrote:

> >  Are you wanting to break out of the traditional and frankly pretty
> boring play-every-note / all-notes-same-length vibe of "normal" step
> sequencers?
>
> Yes. I need adjustable step durations with forward, backward or random
> playback availability.
>
>
>
> >  Smooth encoder or detented encoder?
>
> Doesn’t matter..
>
>
>
> >  What maximum clock rate are you aiming at?
>
> Around 16Hz max sequence speed (micro-controller running at 20Mhz)
>
>
>
> >  One feature of the Doepfer A-155 (easily my favourite "traditional"
> step sequencer, particularly with the A-154 sequencer controller attached)
> that I really, really like is the ability to change the pot range — fine >
>  >  control when you need it, or wide span when you need it.
>
> A rotary encoder would be a fixed and very wide span CV adjustment on each
> steps.
>
>
>
> Still thinking.. (computing..)
>
> Jean-Pierre
>
>
>
> *De :* john slee [mailto:indigoid at oldcorollas.org]
> *Envoyé :* 23 juillet 2020 22:33
> *À :* Jean-Pierre Desrochers
> *Cc :* SYNTH DIY
> *Objet :* Re: [sdiy] DOTCOM Analog Sequencer.. next project startup..
>
>
>
> Are you wanting to break out of the traditional and frankly pretty boring
> play-every-note / all-notes-same-length vibe of "normal" step sequencers?
>
>
>
> Memory requirements should be negligible with any modern microcontroller,
> considering the number of steps and the resolution required — even if you
> added pattern and song storage, which would work well with rotary encoders.
>
>
>
> I have assumed you will have a microcontroller regardless of pots/encoder
> choice, as you'd not need to add many features before the micro was cheaper
> than the equivalent CMOS logic.
>
>
>
> Smooth encoder or detented encoder?
>
>
>
> What maximum clock rate are you aiming at?
>
>
>
> One feature of the Doepfer A-155 (easily my favourite "traditional" step
> sequencer, particularly with the A-154 sequencer controller attached) that
> I really, really like is the ability to change the pot range — fine control
> when you need it, or wide span when you need it.
>
>
>
> John
>
>
>
> On Fri, 24 Jul 2020 at 10:09, Jean-Pierre Desrochers <jpdesroc at oricom.ca>
> wrote:
>
> I'm starting to think about my next DOTCOM analog module:
> a 16 steps sequencer (maybe 32 steps).
> So far I'd have 2 choices for the final number of steps CV adjustments.
>
> - Standard CV pots sequenced with gates
>   pros: cost is cheap, the note value is physicaly kept by each pots
>   cons: bad note precision on large span (I'd like a 61 notes span on each
> CV adj),
>               span must be kept not too large..
>
> - Rotary encoders
>   pros: Very large CV span can be achieved on each steps (beyond 61
> notes),
>              quantization easy to be achieved on each steps adjustments.
>   cons: expensive (are they all ?), need for data memory to keep every note
> values (micro-processor needed)
>
> All the gates could be generated by the same micro or
> from a precise adjustable master clock
>
> What do you think from your past experiences ?
>
> Jean-Pierre
>
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