I have set up my Yamaha dtx 502 kit after long term storage and can't get the kick drum to work. I've tried its cable in other drums and other drums cables in the kick drum but only get silence (when they are plugged in). The strange thing is, when I touch the tip of the kick drum cable I get a rolling kick drum. Also, when I touch the sides of the jack plug I get cymbal sounds!
I have done multiple factory resets and selected various drum kits but the effect is always the same.