The pair is working well. Would consider selling separate but prefer together. RESPONSIVE KICK TRIGGERING FOR ANY PERCUSSION SETUP from the roland site: This dynamics-sensitive kick drum trigger can be used with a standard kick drum pedal. It features a mix input for chaining two KD-7's for double-bass setup, and comes with a Beater. The KD-7 is the ideal kick trigger for use with the HPD-15 and RMP-1.