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

[john slee]

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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