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This is off the top of my head but if you're not using a CPU you'll
probably need scale trimmers for the OSC freq CVs and either manual
tune knobs or timmers for each oscillator. The six trak had a tune
function whereby the CVs were adjusted in software. This chip was
designed with a CPU in mind and there is a note in the datasheet that
nonlinearities exist in the freq CV ranges at the extremes. These were
intended to be corrected for in software. Depending on your intended
use this may or may not be a problem.<br>
<br>
One of the best features of the SixTrak and some other SCI synths of
that era was the stack mode, where it became a multi-timbral mono synth
with each of the six voices assigned a different program. I think
that's much more useful (or at least more versatile) than just a six
oscillator mono-synth, but don't know how deep into the software you're
able to get.<br>
<br>
Good Luck.<br>
<br>
Dave Moylan<br>
<br>
Travis Shire wrote:
<blockquote cite="mid000a01c5c966$70204f60$c5150a47@cyberup0n1qn6z"
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<div><font face="Arial" size="2">Hey kids</font></div>
<div> </div>
<div><font face="Arial" size="2">I have a project in the works for a
(up to) 6 osc monosynth using the 3394 ic mainly as an oscillator. I
will be using a seperate multimode filter and have some SSM2056 to use
for env gens. LFO's are up in the air as of now.</font></div>
<div> </div>
<div><font face="Arial" size="2">What I am wondering about is when
paralelling these voice ic's, will there be a need for buffering ctrl
voltages? I'm not sure if these will interfere with each other but I've
not worked with these before. Actually this will be my first building
project so I'm sure there'll be a wrong turn or two. </font></div>
<div> </div>
<div><font face="Arial" size="2">I am taking a bit of a shortcut tho.
I have a pcb with the 6 3394's already on it that was OEM'd by
Sequential for another company in the early 80s. It is *very* similar
to a sixtrak. Main difference being a 2764 program eprom instead of the
6trk's 12128, and one less 6116 ram. Responds to midi input with an
optocoupler interface (on voice 1 only).</font></div>
<div> </div>
<div><font face="Arial" size="2">Input/ideas welcome.</font></div>
<div> </div>
<div><font face="Arial" size="2">Travis</font></div>
<div> </div>
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