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Subject: FW: (AH) Roland Jupiter-4 tuning.

From: "Verschut, Ricardo" <Ricardo_Verschut@...
Date: 1999-04-14

-----Original Message-----
From: Jim Eisele [mailto:jime@...]
Sent: Monday, March 29, 1999 3:53 PM
To: analogue-digest@...
Subject: Re: [AH] Roland Jupiter-4 tuning.

I'm suprised that none of the gadget heads gave answer to this...

I ∗think∗ your problem has something to do with how the oscillators are
tracking voltage over the octave. You need a voltage meter & an
oscilliscope to set it up properly. From what I understand the heat sink
isn't of enough mass and overheating quickly effects the tuning.

But don't ask me I'm just a freaking piano player that had the opportunity
to be blown away by a Prophet-5 somewhere around the age of 15.


>From: "monsieur kulma hattu" <kulma.hattu@...>

>I just got a JP-4 before today, and I tuned it using the 4 screws inside
>machine on the soundcards (because the screws in the back didn't turn
>enough). But, there seems to be a problem with module D (if poly-2 plays
>A-B-C-D... If D-C-B-A, then the problem would be in module A). If I for
>example tune it to play right on C-2, and then play C-3, it's just a tad
>higher than it should be. On C-1, it's a tad lower. What knob should I turn
>to get this tuned right? I tried the freq. and width knobs (the plastic
>ones, on the sound cards) but they didn't seem to have any effect at all.
>Any info appreciated, and carefully read. Thanks.