There are a secondary set of regulators on the main board that provide the +/- 5.6V to drive the analog CV`s in the JX8p.....check around Q3 on the mainboard if this has gone bad it will get very hot very quickly when powered up ( mind your fingers)....Had one go bad on a JX10 and would lead to all kinds of horrible distortion like noises before the voltage dropped and shut the VCA/VCF down to 0V