First, here are the outputs of the trigger-pads. Yellow is "tip" of a TRS connector, cyan is "ring". Both the bell and the dampening signals of the cymbals connect to the ring and there's a constant voltage offset (which you don't see because the 2nd (cyan) channel was AC coupled.
PDX-100 Snare Pad
CY-13R Ride Cymbal, "Cymbal" connector:
Ride Cymbal, "Bell" connector:
Also, I traced the pinout of the Roland TD-25 multipin/dsub connector.
/--+
+-/ |
| O | 1 KIK-T
T1-T 14 | O |
| O | 2 KIK gnd
T1-R 15 | O |
| O | 3 SNR-T
T1 gnd 16 | O |
| O | 4 SNR-R
T2-T 17 | O |
| O | 5 SNR gnd
T2-R 18 | O |
| O | 6 HH+T2 gnd
T3 gnd 19 | O |
| O | 7 HH-T
T3-T 20 | O |
| O | 8 HH-R
T3-R 21 | O |
| O | 9 HHC gnd
RD/RDB gnd 22 | O |
| O | 10 HHC-T
RD-R 23 | O |
| O | 11 CR1 gnd
RD-T 24 | O |
| O | 12 CR1 T
RDB-R 25 | O |
| O | 13 CR1 R
+-\ |
\-+
gnd: sleeve/ground, T: tip, R: ring
T1/T2/T3: Tom 1, 2, 3
RD: Ride
RDB: Ride Bell
HH: Hihat
HHC: Hihat pedal
KIK: Kick/Bassdrum
SNR: Snare
CR1: Crash Cymbal
