From yahoo Sent Mon, Jul 2nd 2018, 07:54
Hello, module A-113 offers only subharmonis in the range 1/1...1/24 derived from an external VCO (e.g. A-111-3) and cannot be octave reduced. You find a detailed desciption of the module on our website: www.doepfer.com > English > PRODUCTS > A-100 > Module Overview > A-113 Best wishes Dieter Doepfer > For many years I have been interested in microtonal music. One of > my favourite composers is Harry Partch who developed an > intonational system that used 6 notes chords (hexads) derived > from both the harmonic and subharmonic series. The harmonic > chords were reduced into a span of a almost an octave and a half > rather than the 4 octaves that the chords would have spanned if > they were not octave reduced. If this does not make sense, > Partch's otonal (harmonic series) chords had the following ratios > 1/1, 5/4, 3/2, 7/4, (2/1), 9/4, 11/4. If this chord was not > octave reduced it would have the following ratios (in ascending > order) 1/1, 3/1, 5/1, 7/1, 9/1, 11/1. Partch also used > subharmonic chords which he called utonal (from the word > undertone). The utonal chords are mirror images of the otonal > (from the word overtone) chords. For the mathematically inclined > the ratios are in descending order 2/1, 8/5, 4/3, 8/7, (1/1), > 16/9, 16/11. Again if these chords were not reduced to an octave > and a half span they would have the following ratios (and > different order): 1/1, 1/3, 1/5, 1/7, 1/9, 1/11. > For more information regarding Partch's chordal structures see > this page http://www.chrysalis-foundation.org/Partch-s_Diamond.htm > > I am sure you are wondering what this has to do with the Doepfer > A-100 system? Well, I currently use a Doepfer A-198 > Trautonium-Manual / Ribbon-Controller with a Tubbutec microtonal > CV quantizer. I feed the quantized CV to an oscillator and then > send the oscillator audio to an Erthenvar patch chord module > which has an Equal Tempered, just intonation, and > Harmonic/Subharmonic modes. I use an doepfer A-143-1 to a quad > vca for creating arpeggios from the chord outputs. While this > setup is good, I wish to have the freedom to choose the chordal > mixes available and to change them during performance. I believe > that the A-113 subharmonic generator module may be able to do > this. Does this module only do subharmonics or are harmonics also > available? If the a-113 can only do subharmonics, can they be > octave reduced ? Also is there a limit to the divisor (or > multiplier if harmonics are possible). By this I mean is it > possible to divide by 11, 13 or 17 etc ? > > If the subharmonics cannot be octave reduced then is there > another way to do this? Perhaps a precision adder or something could help? > > Sorry for the long post > > Cheers, > > Justin > > > > > ------------------------------------ ------------------------------------ ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Doepfer_a100/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Doepfer_a100/join (Yahoo! ID required) <*> To change settings via email: xxxxxxx_xxxx-xxxxxx@xxxxxxxxxxx.xxx xxxxxxx_xxxx-xxxxxxxxxxxx@xxxxxxxxxxx.xxx <*> To unsubscribe from this group, send an email to: xxxxxxx_xxxx-xxxxxxxxxxx@xxxxxxxxxxx.xxx <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/