Topic: Multimoog tuning woes

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Posted at September 8, 2006, 1:57 pm:

Ive got an old multimoog that has been messed around with quite a bit by the previous owner.
Ive downloaded the micro/multimoog service manual and tried for hours to get the tuning procedure down, and its getting pretty close to being in tune but there are still quite a few problems im having, as well as terms i dont really understand that they talk about in the service manual.

First, lets go over stuff i dont understand...
-What the hell is 'zero beat' and how do i measure it? (i do have access to an oscilliscope and a pretty accurate digital tuner if either of these help.)

-It looks very much like the previous owner was messing around with the source chip temperature adjustment and keyboard CV trim pots inside the synth.
The CV im not to concerned with, but i really dont understand the procedure for fixing the source temp.

-What is trill trim? Ive messed with it, but i cant hear any audible difference.

-I dont fully understand the relationship of osc range, osc scale, and osc hi for tuning. I think i've kinda figured out osc range and scale, but osc hi is a mystery. hearing a fresh explanation of the 3 might make these concepts 'click' for me.

one of the biggest problems i am seeing on this is probably related to osc range. When im tuning on LO-F, i seem to end up slightly flat as i go up octaves until by the time i am at HI-F i am a full semitone flat.
Tweaking the osc range seems to help, but i have the trim pot turned all the way and it is still flat. Is this a bad trim pot or am i missing another adjustment somewhere?

Anyways, i'd really appreaciate some advice from someone who's done this before so i can get this beastie back in tune and do some recording with it.

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

Replies:

That's a BIG problem.

Beating occurs when the oscillators are close to being in tune and you...

Ok, i had my local moog specialist have a look at this beastie for me ...


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