m99999

sorry for my bad english. i built a cocktail table with i-pac 4 and optipac. the arcade advmame emulator works very fine with my trackball and both rotary paddles. only stella makes problems. if i select the menue all devices are working good (trackball and both rotary paddles) but e.g. in Video Olympics (1978) if i move paddle0 then paddle1 stops moving. paddle1 is moving correctly only if there is no movement with paddle0. has anyone an idea?