Topic: i think there's a problem with my CP-251 - please advise

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Posted at September 16, 2003, 12:59 am:

i think the S&H trigger input is acting funny, but i'm not sure.

test 1:

* MF101 envelope out to the trig of the 251's S&H
* S&H out 1 to cutoff of the 101

results: nothing! the cutoff filter doesn't move.

if i remove the S&H trigger input, the S&H resumes input from the square wave of the 251 and outputs as usual (i get the bubbly changing filter sound)

control: i know the env out of the 251 is functioning correctly. i hooked it up to the freq input of the 102 and it functions as expected (the pitch of the carrier decays with the falling envelope)

test 2:

* LFO out from the 102 to the trig in of the 251's S&H
* S&H out 1 the cutoff in of the 101

results: the cutoff doesn't move.

control: i know the LFO out is working correctly, if i connect the LFO out of the 102 to the cutoff jack of the 101, the cutoff filter is correctly oscillated by the wave and frequency of the 102's LFO.

this seems to indicate that the S&H input is not functioning. i've tried this test with many patch cables and other obvious things. is my 251 broken or am i doing something wrong?

Original of the message was taken from http://www.moogmusic.com/forum/

Replies:

i should add that it's been like this since i first received it (new) ...

What you're trying should work.

routing the square wave to the trig in seems to work properly.

The only thing I could think of is that the output from the MF-102 isn...

that did the trick - routing the 102's LFO into the mixer and boosting...

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