[sdiy] Quantizer selectability?

[Metrophage]

--- John Speth <johnspeth at yahoo.com> wrote:

> The Doepfer A156 quantizer is a good example of what
> you're after.  I don't know how it's implemented but
> I'll bet it's not high tech.

Probably not... I want to set various scales, but not all with the same
tuning. I'd prefer to play with tunings first, and then get to more
specific scales of those later. I should have been more specific.

> Unless the goal is to make wierd tunings, it would
> seem to me that algorithmic manipulation of the
> digitized CV stream is the simplest way to go.

I will need the diverse tunings for some of my goals. I play with
algorithms for my newbie composition and improvisation. I think I can
do a lot with the CVs in the analog world, I mainly want this first
project for the output of my several incomplete sequencers, though I am
sure I'll find other fun uses for them! Heck, ANY tunings are "weird"
without a quantizer!

> That would suggest using a microcontroller and hence the
> effort would be in software.
> 
> JJS

Eventually, but coding will probably take me some time to learn (which
is fine). Now I don't have money to sink into more parts for micros,
but I do have recycled EPROMs, new TTL and CMOS chips. Of course doing
this algorithmically will be more flexable; but meanwhile I want to
make discrete, simple CV quantizers dedicated to my sequencers. The
main difference is that I don't see any with selectable scales -in
various tunings-, but I expect it's not too difficult to do in ROM
tables somehow.

CJ


> 
> > What interests me though is making an EPROM / DAC
> > quantizer with
> > pushbutton selectable tunings. It appears to me that
> > such quantizers
> > are similar to the VCDOs I have seen. Would I be
> > accurate in my guess
> > that as one can make tables of various waves to step
> > through in a VCDO,
> > that one can just as simply fill a 2764 or 27128
> > with tables which
> > represent a selection of musical scales, and step
> > through them? I
> > suppose there would need to be a comparator to
> > determine which value of
> > a scale is most accurate, in relation to its input
> > at the time. What
> > sort of format would the ROM data be in -
> > frequencies in hex or binary?
> 
> 
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