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Subject: Re: Sync'ing oscillators...

From: JWBarlow@...
Date: 1999-12-29

In a message dated 12/27/99 11:21:54 PM, jlarryh@... writes:

>Now, one of the more experienced modular guys will have to speak to which
>of the available waveforms makes the best sync source.

Where the hell is Bradley (Mr. Emu soft sync man) when you need him (or Crow
or Doug Kraul for that matter -- Crow and Crawl? Wasn't that an old Motown
hit by Howard , Fein, and Howard?)! I'm pretty sure hard sync happens ANYTIME
you plug a rising edge waveform from one oscillator (a master oscillator)
into the sync input of a second (slave) oscillator -- it doesn't matter
whether the (input oscillator's) sync switch is in HARD or SOFT position.
BTW, you can set the master VCO's sync switch to SOFT and it will output a
pulse train which can be used as a hard sync source for the slave VCO, so you
don't need a multiple.

I've never had a good understanding of soft sync since the only VCOs that I
have which offer soft sync are my 3340 based VCOs and the panels they are in
are unlegended, and I long ago for got which input was hard sync and which
was soft. As I understand the MOTM soft sync, there is apparently no
master/slave relationship. Any VCOs that are within 5% of resetting will be
forced to reset but any outside this range will continue their normal period
until they are within the 5% margin.

And let me second the recommendation of Horowitz and Hill's book "The Art of
Electronics" which is a bit expensive but well worth it as both a text and a
reference. The only book which I might recommend more is Hal Chamberlin's
"Musical Applications of Microprocessors" which is out of print, but
available from both Chamberlin (photocopies), and Jeff Dec who has scored
several brand new copies, and sells them at what I believe to be a reasonable
price -- I can give you his e-mail if you're interested. The first third of
Chamberlin's book covers analog synths and interfacing with micros with
schematics for VCOs, VCFs, and VCAs.