The VAD506/VAD507 setup includes the PD-140DS and CY-18DR (VH-14D Hihats with the VAD507) digital pads. When they are connected to the TD-27, the 1/4" RD, RDB, and SNR cables (and HH/HHC cables for VAD507) that are part of the main harness are defeated and cannot be used. If you have extra pads that you're trying to connect, be sure to connect them to the 1/4" CRASH 2 or AUX 1-3 inputs on the back panel of the TD-27 with separate V-Drums cables. PCS-Series cables