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Re: [Doepfer_a100] trigger seq / polyrhythms

2002-02-12 by Florian Anwander

Hi duffnuff 

> say, for a trig seq w 2 or more rows.. can one row be, for lack of a
> better word,  'slaved' to another so the loop cycle time of each
> row is the same length despite each row having different
> numbers of steps?
There are two possibilities:
1.) The digital one needs "simple" mathematics:
You need the lowest common denominator of both clock rates as master-clock
and have to divide this master clock down to the needed individuall values.

Example: you want a 8 step versus 7 step sequence with tempo 120. The
lowest common denominator of 7 and 8 is 56. So you need a clock which runs
with 56 beats per bar.

2.) The "analogue" version uses a phase locked loop (PLL - yeah! again this
funny module): One sequence is running clocked by any wished clock, the
other sequence is clocked by the oscillator of the PLL. The PLL compares
the reset signals of the sequencer counters; if there is a difference it
speeds down or speeds up the frequency of the oscillator. Of course this
will take some time, lets say 20 to 30 cycles.

Kind regards, Florian

PS: You see, why I'd like to have a PLL-Module ;-)
-- 
Florian Anwander                  |ConSol*  HP-Support
Tel.   +49.89.45841-133           |Consulting&Solutions Software GmbH
Fax    +49.89.45841-139           |Franziskanerstr. 38, D-81669 München
email: florian.anwander@consol.de |http://www.consol.de

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