Hi i find this: It makes sense to add LEDs which show the SID selection. This requires a DOUT module with a single shift register (etch your own, build the circuit on a veroboard, or buy a premade MBHP_DOUTX4 board). As this would only allocate 4 pins, you could add three additional LEDs for the SHIFT/UP/DOWN buttons. The LED next to the SHIFT button will flash on each BPM beat later (not implemented yet), the UP LED shows if the CC function is active, and the DOWN LED shows, if the edit function is active. IMPLANTED? Best regards