The TD-50X module supports one fully functioning 3-zone (BELL/BOW/EDGE) pad connected at a time. With the TD-50KV2 setup, the CY-18DR Digital Ride pad is the 3-zone pad, so it's not possible to obtain 3-zone triggering on the CY-16R-T pads as well. The CY-16R-T pads are considered "crash" pads which provide bow/edge triggering. When connecting them to the TD-50X, use the BOW/EDGE output only.