Voltage controlled arpeggiator (was Re: [sdiy] Design Process)

[cheater cheater]

You've just described a multibit ADC

HTH
D.

On Mon, Feb 15, 2010 at 09:43, David G. Dixon <dixon at interchange.ubc.ca> wrote:
>> I've been "back burnering" the idea of a voltage controlled arpeggiator
>> lately, too.
>> Was thinking something simple using an LM3914 bargraph driver with its
>> outputs interfaced to some pots and a CV summer. Might be some
>> interesting options available using the 3914 in "dot" mode and "bar" mode.
>> "dot" mode - each step picks a voltage relative to 0V
>> "bar" mode - each step "stacks" a voltage on top of the previous step.
>
> Hey Oren, that's a very interesting chip!  And it comes in three versions
> (linear, log, and VU meter).  I'm going to have to think about that in the
> shower tomorrow!
>
> The key for a VC arpeggiator (or, at least, the one I'm thinking of) is that
> the CV must simply scan the steps in series, but each step must be
> assignable to a distinct voltage.  It sounds like that's what you are
> thinking of as well.  I'd like to be able to define arpeggio patterns
> involving any number of chromatic tones within a two-octave range, and then
> have that pattern repeat in higher bi-octaves.  How high the pattern would
> repeat would depend on the setting of the CV input attenuator.  Also, how
> the pattern would play would depend entirely on the CV waveform (a triangle
> wave would cause arpeggiation up and down in uniform durations, a saw or
> ramp would cause arpeggiation only down or only up, a sine would give
> pleasing ritardandi at the top and bottom of the pattern, etc).  Also, I
> will need a separate 1V/octave CV input which would tune the arpeggio from a
> keyboard, so that the arpeggio pattern could be played in any key.  The
> two-octave range is also critical, because I don't just want to be able to
> play stock scale or mode patterns (phrygian, mixolydian, lydian dominant,
> altered, etc), but I want to be able to arpeggiate fat jazz chords,
> quartals, etc, and this requires two octaves.
>
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