Please what is best instrument wire and speaker wire to use on Ketron's or any keyboard for that matter. Mine is older MS40. Sales guys at store told me to switch over and use XLR wires from Ketron to amp. This is the 3 wire version. The volume is greatly reduced from that when using simple 1/4 jacks. What's up? Why are the pushing balanced XLR wires and should I use them. My powered speakers and my amp both have XLR inputs.

Personally I would not bother with changing to XLRs--your jack inputs are quite adequate and i presume there is a gain structure on your desk to boost the signal? Just my own opinion
Rusty