what have i done?
2000-12-06 by doc pendergast
h3y all, i'm playin' with the lfo and this is way beyond my scope of comprehension. 1st, the vco is set to coarse=4, fine=3. (with this, the pitch is set about 50 cents higher than A=440) width=5, PWM=10. pulse out to vca. triangle out to lfo FM. 2nd, lfo settin's: rate=10, FM= +5, shape=0 sine from the lfo is plugged into the PWM on the vco. 3rd, EG sustain=7, attack, decay, release=o last, vca gain=0, cvmod=10 by depressin' a C on the keyboard, i get an lfo cycle of what looks like 5sec. (but i have by careful tweakin' gotten it up to 20 sec) however, unlike a slow rate where the LED is green, then red, then gree... etc. this has a dominant LED for about half the period with the other faded, but still lit in the background. as it works through what sorta looks like a normal slow cycle they switch intensities. so the one that was dim is bright and vice versa. on to the sound, as i travel chromatically up the keyboard from C, the lfo cycles get faster until G#, from A up they start to slow down. at an octave above C, the cycle is about 1 sec. this pattern repeats for a couple of octaves(in increasin'ly faster increments) until the lfo cycle is continuously full blast across the rest of the range up. i have uploaded this to the files section if you want to hear it. all i can think is that the frequencies are "harmonically aligned" (for lack of a better term) with the lfo modulation rate(via the tri in from the vco) and therfore in sync(-ish). as i move away from the frequency(C note in my case)that i dialed in, it starts to do what???? i am utterly baffled, and not sure i am even on the right track to the solution. any help would be appreciated. i would love to know what i have done... peace, doc