Everyone,
I have one of my two kits running, and wanted to share a tip. When I first
cranked it up, I couldn't get nasty resonant sweeps at all. In fact, it
would oscillate on its own, but would not oscillate with signal inputs. I
was bummin'.
I finally figured out that I was cranking the input signal (MOTM-300) too
hot. If I back off the attenuators to 12:00, it sounds sharp and clear with
cutting resonance. As I crank the signal more, I get some distortion, and at
the same time the resonance decreases. There is a gain zone where you can
get both distortion and high resonance. Increasing the gain beyond that adds
more distortion, but overwhelms the resonance. Since Paul mentions on the
web site that this design has nonconstant Q with gain, I figure that's what
I'm seeing.
Are your filters behaving like this? Once I figured this out, I was a happy
camper. You can get a nice range of timbral variation just playing with the
gain and resonance interaction - think of it as an input on a guitar amp.
Another tip - the notch setting is most useful either at NO resonance, or
lots of resonance. At no resonance, you get the swept notch kinda stuff. At
high resonance, you can add a resonant peak without cutting highs or lows
like LP or HP modes.
At mid level resonance, however, you are just nullifying the notch and it
will sound pretty close to having no filter at all.
Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@... > From: JWBarlow@...
>
> I really like its nasty overdriven sound, and the input mixer
> will come in
> very handy. I also really like the ability to have three CV
> sources mixed,
> and especially enjoy that reversing attenuator. I find this control best
> suited, for example, to times when during the initial stages of a
> LPF patch
> with a positive going envelope and the attenuator near 1, a mere
> turn of the
> knob towards -1 (and a minor adjustment of the FREQ pot) can take
> a rather
> typical patch in a new direction that one might not have thought.
> Well worth
> the minimal circuitry!
>