Envelope Filter tech question help

space_nerd · Post by **space_nerd** » Tue Nov 21, 2006 7:24 am

Hello there,
I have this question:
which way an guitar signal could trigger the envelope in the moog filter pedal? Has it an envelope follower?
I gues this could be also with a vocal or drum signal.
Has it any sensitivity about when to trigger?
Any help? MC? Kevin?
Thanks!
Nick

asd · Post by **asd** » Tue Nov 21, 2006 1:54 pm

Hey Nick, the 101 has an envelope follower and not an envelope generator so there's not anything that a signal needs to trigger. The envelope follower will 'follow' the volume contour of whatever signal (guitar, drum, vocal, whatever) the pedal is processing.

space_nerd · Post by **space_nerd** » Wed Nov 22, 2006 1:00 pm

Thanks a lot,
I guess that there is an other way to connect an envelope filter after this.
Does the filter be triggered in a synth which has an external input?
(As the original Mini/Voyager/Phatty)
Thanks again and soory for the bad English
Nick

OysterRock · Post by **OysterRock** » Wed Nov 22, 2006 3:23 pm

space_nerd wrote:Thanks a lot,
I guess that there is an other way to connect an envelope filter after this.
Does the filter be triggered in a synth which has an external input?
(As the original Mini/Voyager/Phatty)
Thanks again and soory for the bad English
Nick

If I understand correctly, you are asking if the MF-101 can be used to trigger the envelopes of another synth. The 101 does not have a gate output, but the envelope output can be used as a gate with decent results.

The envelope output can also be used to control the filter or pitch or whatever of a synth with CV inputs.

Am I answering what you are asking?

space_nerd · Post by **space_nerd** » Fri Nov 24, 2006 1:25 pm

Thanks both for the answer:
So the input goes to the envelope follower and this triggers the filter and then you could assign the envelope to the filter (if we talk about a modular synth)
but I guess that, in a synth with external input, ( like the mini/voyager/phatty) there's no envelope follower, right ?
Thanks-Nick

Impossible Sound · Post by **Impossible Sound** » Fri Nov 24, 2006 2:16 pm

"So the input goes to the envelope follower and this triggers the filter..."

An envelope follower tracks the level of the input and outputs a CV signal equal or proportional to the input level. Not sure what you mean by "trigger the filter," a filter is always active.

"and then you could assign the envelope to the filter (if we talk about a modular synth)"

Any CV source, including envelopes, can be assigned to the filter cutoff.

"but I guess that, in a synth with external input, ( like the mini/voyager/phatty) there's no envelope follower, right ?"

Those 3 synths don't have envelpoe followers, but others may.

OysterRock · Post by **OysterRock** » Fri Nov 24, 2006 2:37 pm

space_nerd wrote:Thanks both for the answer:
So the input goes to the envelope follower and this triggers the filter and then you could assign the envelope to the filter (if we talk about a modular synth)
but I guess that, in a synth with external input, ( like the mini/voyager/phatty) there's no envelope follower, right ?
Thanks-Nick

By "triggers the filter" I think he means the controls the cutoff of the MF-101's filter.

The mini/voyager/LP don't have envelope follower circuits, but you can use the envelope output of the 101 to trigger the envelope generators of the Voyager (does the LP have a gate input?) or as a control voltage for input CV parameter on one of these synths.