Here is the definition file for the S2400 with names as specific but brief as possible.
As you can have this set up many different ways you would need 8 different versions for each of the 8 pads set to its own midi channel if you wanted to control each sample/pad individually. just change the output to correspond to the midi channel for that pad.
in that case you will need a new track on pyramid for each pad on the S2400.
NAME:S2400
OUT:
CHANNEL:
7:TrkMixVol
10:Pan_Trk
1:Trk_Lvl
15:Slice_No
16:SliceStart
17:SliceEnd
18:LoopStart
20:LoopTime
21:LoopReps
32:PatChange
7:FilterType
71:Resonanc
72:E1_Rel
73:E1_Attack
74:Cutoff
75:E1_Decay
76:E1_AttHold
77:E1_Sustain
78:E1_SusHold
79:E1_TotalTime
80:E1_PitchMod
81:E1FilAmt
82:E2FilDir
83:E2_Release
84:E2_Attack
85:E2_Decay
86:E2_AttHold
87:E2_Sustain
88:E2_SusHold
89:E2_TotalTime
90:E2_PitchMod
91:E2_FilterAMT
92:E2_FilDir
120:All_Sound_Off
121:Reset
123:ALL_NOTE_OFF