Moog Music Forum

hello everybody,

what i wanna do is to control the cutoff of my rme via an external audio signal volume. say we have a loud input signal --> cutoff open, low volume --> cut off closed.

can i do this with the vx-352? do i need an additional tool to get CV signals out of the audio signal?

for example i wanna connect my guitar the rme and use it filters to treat the guitar.

thanks for any hints.

You will need some sort of envelope follower. There's one on the MF-101 and MF-107.

Guitar audio -> MF-101 audio in
MF-101 audio out -> RME External in
MF-101 Envelope out -> (attenuator) -> VX-352 cutoff input

The attenuator is recommended, as you will be able to adjust the envelope amount. Seeing as you have a VX-352 with active attenuators (lucky b*stard ) you can probably get an interesting range of sounds.

Now, another avenue would be to trigger the RME's envelope (ADSR, instead of an envelope following the input signal).

Here, you would use the same patching, but send the envelope signal to the gate input (probably filter (or both with a multiple)). This is what i suggested here, but it didn't seem to work. Perhaps increasing the attenuation or adding an offset with the 352 might give better results. This is because the gate input needs a +5V signal to trigger.

Another way to trigger envelopes might be to use a little comparator circuit. These are commonly found at hobby electronic stores in the form of a Vox Sound Switch. Here's an example. It doesn't have an audio output, though, so it would need a mod or the use of an aux signal. [/i]

hi, thanks for your answer,

I'm thinking of buying the Doepfer A119 module which is an envelope follower für audio signal with CV outputs. I could connect this to the vx-352 and modulate the filter cutoff.

the mooger foogers will worl of course but are more xpensive than this tool.

maybe later ,-)

This should work nicely; it even has a gate output so you can trigger the RME envelopes as I suggested earlier.