[sdiy] Quantizer project.. final choices with all that..
jpdesroc at oricom.ca
Wed Jul 7 16:30:34 CEST 2021
After all these very technical talks & exchanges about scales and intervals
I think Ill build my next quantizer in my make it simple way.
*Using about the same hardware I used for my M114
> CV/GATE delay
which has SPI 16 bits ADC/DACs but this time without SPI RAM.
It can support 0 to +8vdc IN/OUT CVs.
*Using preformatted scale lookup tables (up to 100 of these)
(rotary encoder/display selectable)
*As David proposed, using equal voltage intervals between each notes
(more musical and predictable CV output results)
*A separate 12 positions rotary switch for semitones transposing the CV
*And finally a MIDI output that tracks with the selected CV scale outputs
This pleases me..
Thanks to all of you for sharing your precious knowledge !
De : David G Dixon [mailto:dixon at mail.ubc.ca]
Envoyé : 5 juillet 2021 19:43
À : 'Jean-Pierre Desrochers'; 'SDIY'
Objet : RE: [sdiy] Quantizer project.. incoming CV's switching point to
change to quantized output CV's ...
I don't know diddly-squat about code, but I've been working on an analog
quantizer with logic for generating various scales, and I must say that I'm
a strong advocate of the "equal voltage invervals between each note"
Of course, for the chromatic scale, this is a no-brainer: 83.33 mV per note.
However, if you want to quantize a major triad, I would use 333.33 mV per
note. For a major scale, 142.86 mV per note. Et cetera.
Why? Because if you are running the scales or arpeggios by playing the
quantizer with a triangle wave LFO, you will want each note to last for the
same amount of time. Any other approach will impose a rhythm that will
favour notes that are farther away in pitch from the others.
As usual, the right answer is the musical one, not the technical one.
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of
Sent: Sunday, July 04, 2021 10:35 AM
Subject: [sdiy] Quantizer project.. incoming CV's switching point to change
to quantized output CV's ...
[CAUTION: Non-UBC Email]
I'm starting a CV quantizer design and am wondering
about the following things:
Let's assume a normal quantized semi-tone scale:
All the incoming CV's are quantized to semi-tones like this:
incoming CV 'around' C, output quantized CV -> C
incoming CV 'around' C#, output quantized CV -> C#
incoming CV 'around' D, output quantized CV -> D
and so on..
12 equally spaced output quantized intervals. OK.
But if the quantized scale output is a TRIAD like
C-E-G-C-E-G-C, etc... ( 3 quantized intervals)
where are the switching bounderies of each incoming note CV's
to change to the next outputed quantized note ?
This question is for ascending and/or descending notes..
Same question for a quantized PENTATONIC major scale output like
C-D#-F-G-A#-C-D#-F-G-A#-C, etc.. ( 5 quantized intervals)
I would think of dividing the octave range with
equal intervals with the number of intervals
inside the actual quantized scale..
That's 3 intervals
1 octave = 1 volt
so 1volt/3 intervals = 0.333v between each quantized notes (??)
PENTATONIC major scale C-D#-F-G-A#-C
That's 5 intervals
1 octave = 1 volt
so 1volt/5 intervals = 0.20v between each quantized notes (??)
But... I don't think that is working this way..
I think I must keep the incoming CV interval sizes
and use them for the quantized switch points.. (???)
Your opinion on that ??
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Synth-diy