On Thu, 13 Apr 2006, Tim Bieniosek wrote:
> So! The interesting results from last night's experimenting is... I
> like my "mistake" better :)
>
> It sounds like you get less of the filter cutoff range if you do it the
> "right" way. I couldn't get the filter to do the whole subsonic -
> infrasonic sweep that I showed off in my demos, or the vowel sounds.
>
> So as soon as I was done testing the intended mod, I put mine back to
> the wrong way :) The sounds are just cooler. I'd invite others to try
> it out and see what they like. (There is also a photo up of the "right
> way" now.)
=======================
i ∗think∗ what's happening is that as you turn the FM knob, it's also
affecting the cutoff. you could (according to this theory) achieve the
same thing by wiring it the "right" way and turning the FM and cutoff knob
together.
you could also turn the knobs in opposite directions, or independently, or
at different rates... in other words, you can do the same thing, and more.
the "mistake" would sound more dynamic because it's doing more than one
thing at a time; adjusting the FM and the cutoff.
if it sounds good, do it. but if you get a chance to test out my theory,
let us know how it goes.
> I think I've nailed down the other issue with some notes not being
> affected. As I suspected, in 8-voice mode you don't get the FM effect
> if the CPU decides to use DCO 2. For instance, playing a run you get 4
> notes with FM follwed by 4 notes, no FM. In 4 voice mode you don't have
> this problem. I also tested it by bridging r74 to r76 (summing the
> outputs of the DCOs) and that fixed the note skipping.
=============
that makes sense...
> There must be a place further down the line where we can take the full
> audio signal and use that as the modulation source?
==============
yes, but not without extra circuitry or potential to really screw things
up. one good place to tap into that signal would be IC1 pins 10/19, but it
would need to be amplified before you could wire it into other
destinations. before that point, you've got two separate paths; after that
point, you've got filtered (mutilated, moog-slayed and fm'ed) signal. it
might be a good source for some modulation routings, but i have no plans
to look into it.
prior to that, DCO1 and DCO2 have independent paths, arriving at IC1 pins
20/21.
--
...atom
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