Good explanation Florian

Thanks

David Salter
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________________________________

From: Doepfer_a100@yahoogroups.com [mailto: Doepfer_a100@yahoogroups.com ]
On Behalf Of Florian Anwander
Sent: 17 May 2006 12:20
To: Doepfer_a100@yahoogroups.com
Subject: Re: 1 Re: ideas/opinions on quantizer and (VC)
arpeggiator


Hi Levka

> I do not yet understand completely what Florian means by this;
> Florian; Could you perhaps elaborate a little on this

Ok, but it will be a little bit longish...

Originally an arpeggiator as in Roland Jupiter Series, in SH101 or in
the Korg Monopoly/Polysix was a simply "misusage" of the keyboard
scanning electronics. The keyboard of these synths is like a matrix
scanner. The electronics send addresses (usally 6Bit) in a certain order

to this matrix, read the data (=pressed keys) from this matrix into a
buffer, and distribute these (key-)data from the buffer to the sound
generation.

Usually this reading from the buffer is very(!) fast (at some hundered
kHz rate). For arpeggiating the buffer is simply read slowly at the rate

of the (internal or external) clock of the arpeggio.
So at each trigger of the clocksignal provides the next key data to the
sound generation.

For up, down, up/down arpeggios you simply change the way the matrix of
the keyboard is addressed. whether the adresses are counted up or down
or....

This is the classic arppeggio function in basic.

Now you may imagine, that it would be great to have influence on the
address data of the keyboard scanner. Example: normally the order of the

notes are
adresse 000 001 010 011 100 101 110 111 (order= a0 a1 a2)
notes c c# d d# e f f# g
If I press a c-major the order of the notes in the buffer will be
"c e g". A c-sus9 will be "c d f g"

Now i simply invert adress a1:
adresse 010 011 000 001 110 111 100 101
notes d d# c c# f# g e f
Now the order of the notes in the buffer (and the order of an arpeggio)
will be "c g e". The c-sus9 is now "d c g f"

You see that a simple conversion of the address data does create
complete new arpeggio patterns. Imagine what is possible, if you do such

conversion depending on other sequencings, on states of some
controlvoltages or what ever...



I know, that a MIDI based arpeggiator system would have to simulate
this, but I think, it would be worth the effort :-)



Florian



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