[sdiy] VERY cool/bizarre: Buchla noise

[phillip m gallo]

Peter,

The audible repetition of the MM5837 is what made it so popular as a source
for S/H, you could recall your pseudo-sequence pretty easily.

regards,
p


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Peter Grenader
Sent: Monday, September 27, 2004 6:58 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] VERY cool/bizarre: Buchla noise


OK, check this out:

Something tells me the signal coming out of the MM5837 ain't true random,
right?  I say this because:

I made a clone of the fluctuating voltage section of the Source of
Uncertainty.  As far as the parts, it to the letter of the law - including
the digital noise chip mentioned above.

OK, so...in order to create random pulses I ran the output of the noise outs
of that module into my Event Timer, which is nothing more than a comparator
with a variable reference in the form of a pot. So depending on where that
threshold is set you'll get (what I would expect) either a lot random pulses
-or few, right?

I mean, this makes sense, right?

Well - I'm getting repeating patterns out of it and I'm not talking long
phrases that I have to concentrate on to determine they repeat.  these are
short repeating phrases.  For instance (and excuse my ascii), I've presently
got the -3 dB noise patched into the ET and I'm getting:

where:

E is an eight note

e is an eight rest

T is a sixteenth triplet

S is a sixteenth note

s is a sixteenth rest

and a period after each is dotted

eTEE over and over again.

coming from the 'flat' out I'm getting:

E.eSS over and over again

out of the +3 dB out I'm getting:

SSESS



...anyone care to 'splain this?

???


- P









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