Crumar Musical Instruments User Group.

hello, just joined this group. i'm from the philippines, just bought 
a used crumar ds2 from a surplus shop.  when i try to figure out how 
to work each knob (checking also if everything still works), all seem 
to affect the notes i play- meaning all knobs work.  although some 
knobs i believe have lost some of its depth, like the resonance knob, 
at lower levels: its just like playing hiss with the keys, but at its 
peak, really tweaks excellent.  it also cracks when i turn it, 
suddenly changes volume.  some of the other knobs are also like that- 
volume, asdr range. i think they're just dirty(hopefully).  Any 
suggestions how to clean it? 

anyone also know about its polyphonic and external features?  when i 
try to place a drum machine in the external, the polyphonic feature 
works.  but without anything attached, only the single notes work.  
is it suppose to be like that?  and if you want to play the ds 2 
live, i figured, i'd be needing two amps: one through the headphone 
output, and one through the polyphonic output.  any easier suggestion?


thanks,

diego