Roland JX3P

[danial stocks]

>Hi List,
>
>I've just been offered a Roland JX3P and also a Korg Delta for cheap 'cos
>they both have faults. Before I get off my backside and travel all the way
>to look at them, has anyone dealt with the following faults on either of
>these synths...? These are the faults that the seller describes. My main
>concern is availability of replacement parts for these models.
>
>Roland JX3P: sounds like one of the oscillators is dead, because it 'misses
>out some notes'. This synth uses DCO's. In addition, the seller descibed
>some problems with entering certain parameters. I think the user interface
>is playing up on this one (it's hard to be specific as I haven't seen it).
>He said something about filter settings not working properly.
>
The 'missing notes'... if the certain keys dont work, this is prolly the 
keyboard itself.... take the key off, lift the little rubber mat, rub the 
board contacts with a pencil eraser, also do the black rubber bit in this 
way [ gently] the rubber bit will often have an imprint of the board 
contacts on it.. if you have rubbed this off then it usu fixes the problem. 
.the rubber mat is a long strip so sometime you have to remove a few keys to 
get to the dodgy one..
I'd also check the buttons as far as the troubs entering parameters, if it 
aint that, then you got a lotta work stuffing in the digital section.



>Also, this synth does not come with that pretty essential external
>controller box. If I got the synth cheap enough, I thought about trying to
>build a suitable control unit myself rather than trying to find an original
>one. Daft idea?

probably. the ext box is a set of knobs & switches multiplexed & encoded by 
an on board microcontroller.. if you can get a hold of the spec for the 
comms from the box to the synth, it could be good for some interesting modes 
tho.. [extra lfos etc?] also note this synth apparently cant run the box & 
the midi in @ the same time..



Cheers,
Dan
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