[sdiy] PIC Quantizer project

[Tim Parkhurst]

> -----Original Message-----
> From: xamboldt [mailto:xamboldt at earthlink.net]
> Sent: Monday, November 15, 2004 12:02 PM
> To: 'Synth DIY List'
> Subject: Re: [sdiy] PIC Quantizer project
> 
> What about a quarter-tone scale (24 notes/octave)? That way not only would
> you have the aforementioned quarter-tone scale (perfect for synthesizing
> some of the most challenging pieces of Western music, such as the bassline
> hook in "These Boots Are Made For Walking"), but you could toss a
precision
> op-amp on the output at 2x gain and you'd have 10 octaves of half-tone (12
> notes/octave). Or am I missing something obvious?
> 
> -chris
> 
 
How about using the aforementioned 2X gain op amp and having this chip be
the front end of the New Generation of Low Voltage Modulars? (NGLVM or just
LVM if you prefer)

All this talk of presets and programmable functions and voltage levels got
me thinking (my first mistake, I know). As has been suggested several times
before, set up a synth with signal levels in a 0 to 5 volt range. This makes
it a LOT easier to use nifty little bits like digi-pots and cheap analog
switches for routing and programming. There is still the problem with
signals like EG outputs which work nicely at 0 to +5V, versus bi-polar
signals like LFO outputs which work better with 
-2.5 to +2.5, or maybe 0 to +5V but centered around 2.5V, but that's another
argument/thread. One nice thing about standard modular signal levels though,
is the fact that a 0 to +10V signal gives you a nice 10 octave sweep range
on your VCOs. Well, maybe, just maybe for LVMs we should think of

<blasphemy>
switching to 0.5V per octave instead of the 'traditional' 1V per octave.
Then we can still get a full 10 octaves out of the CV range.
</blasphemy>

Anyway, scaling the CVs from other sources would be easy, but I thought that
might just be one application of a quantizer chip.

I await your comments, insults, tars and feathers. 


Tim (Haven't really thought this through, but I thought I'd talk about it as
an authority anyway) Servo



BTW - I'm back! I was away for several days at a mechanical design Geometric
Dimensioning and Tolerancing workshop... it was more fun than the title
makes it sound... IF you're a CAD geek.

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