Doepfer

Hey all!
I've got this modual that i can't get to work...it's an A-142 Voltage 
Controlled Decay/Gate.

I understand that it generates a simple Attach/Decay Env from a Trig 
signal...but my system doesn't make have Trig. All my stuff is GATE.

Question:
how can you convert a GATE signal into TRIG.

QUESTION:
....how can i utilise this modual??

ROCK!

KARL.