Filter sweep down instead of up with MF-101 ?

The Moog Forum Moogerfooger Forum
1

Does anyone know of any mods or patches that would accomplish this? Would sending an inverted ENVELOPE OUT signal to the CUTOFF IN jack accomplish this?

2

Have a look through this first:

http://moogmusic.com/forum/viewtopic.php?t=406&highlight=sawtooth+lfo

Basically you will need to attenuate your envelope CV after it is inverted (i.e add +5V) because the CV is not bipolar. (A bipolar CV would be +x to -x).

It should work after this. Hope it helps; the thread is quite useful.

3

cp251 inverted output

4

Is the inverted output negative CV or positive CV? I think it needs to be positive correct? Are you sure this would work?

5

it is the way.
101 env out to cp251 mixer. Negative (inverted) out to cutoff.

you can even run the positive signal to the phaser sweep and have 2 sweeps going in different directions.

6

Thanks, kb. Any chance I can get a sound clip of the inverted sweep? I read somewhere that it doesn’t sound like a typical down-sweep. I understood that it sounds more like a “owwaahh” instead of a “owwwww”

7

I can’t mp3 just yet. But, I do have some wild recordings to share when I get a chance.