well check your manual. the fruit yloops manual covers how to do this in great detail and easy to understand terms. also how are you wiring up your mc-303

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Well, the mc 303 is hooked up into my soundcard through a Y-splitter, and to my joystick port with a midi cord. Was reading the fruity manual yesterday, and trying to follow it in setting the groovebox up, no luck so far though, just doesn't register any signal traveling through the midi cord. works for my evolution keyboard, I think i need to change a sync setting on the groovebox itself though.