Roland V-Drums TD-8 Owner's Manual page 28

Before You Begin Playing
If you are using the PD-7, PD-9, or KD-7, move the pad's polarity switch to
the "-(Roland)" position. For more detailed information regarding the
polarity switch, refer to your PD-7, PD-9, or KD-7 owner's manual.
fig.Q1-003
POLARITY
+
- (Roland)
With the optional cable (PCS-31) or standard insert cable, two pads may be
connected to the trigger inputs 1/2 (KICK1/2) and 11/12 (AUX1/2).
fig.Q1-005.e
PD-7
28
PCS-31 (optional)
KD-80