The 3000 isn't one of the MPC's I have but if you mean triggering Ableton's Drum Racks this is the default MIDI layout the MPC's need to match :
Pad 1- Note # 60
Pad 2 - Note # 62
Pad 3 - Note # 64
Pad 4 - Note # 65
Pad 5 - Note # 67
Pad 6 - Note # 69
Pad 7 - Note # 71
Pad 8 - Note # 72 (Pads 1-8 all on MIDI Channel 1A)
Pad 9 - Note # 60 (On MIDI Channel 2A)
Pad 10 - Note # 62 (MIDI 2A)
Pad 11 - Note # 64 (MIDI 2A)
Pad 12 - Note # 65 (MIDI 2A)
Pad 13 - Note # 67 (MIDI 2A)
Pad 14 - Note # 69 (MIDI 2A)
Pad 15 - Note # 71 (MIDI 2A)
Pad 16 - Note # 72 (MIDI 2A)
Pad 17 - Note # 36 (MIDI 3A)
Pad 18 - Note # 37 (MIDI 3A)
Pad 19 - Note # 38 (MIDI 3A)
Pad 20 - Note # 39 (MIDI 3A)
Pad 21 - Note # 40 (MIDI 3A)
Pad 22 - Note # 41 (MIDI 3A)
Pad 23 - Note # 42 (MIDI 3A)
Pad 24 - Note # 43 (MIDI 3A)
Pad 25 - Note # 44 (MIDI 3A)
Pad 26 - Note # 45 (MIDI 3A)
Pad 27 - Note # 46 (MIDI 3A)
Pad 28 - Note # 47 (MIDI 3A)
Pad 29 - Note # 48 (MIDI 3A)
Pad 30 - Note # 49 (MIDI 3A)
Pad 31 - Note # 50 (MIDI 3A)
Pad 32 - Note # 51 (MIDI 3A)
Pads 33 - 64 Note #'s 52-83 (All on MIDI Channel 3A)
Drum Racks default to start with MIDI note # 60 on the first pad, but to the right of the 16 pad grid there is a box that allows you select a group of 16 notes over 7 octaves. A MIDI controller/MPC sending MIDI out will control whatever box of 16 are highlighted if it's pads are programmed like the assignments listed above. But only with pads 1-16. Pads 17-64 will always control the same sounds no matter where the highlight box in Ableton's Drum Rack is focused.
It's actually a pretty cool system. You use 4 MPC/MPD pad banks but the Drum Rack's focus grid can allow you access to 128 sounds if you don't mind using the mouse to move the focus box.
Just make sure to have In/Out enabled in Ableton's View settings so it's easier to switch to MIDI from "All Ins" or the Specific Port/Interface the MPC is plugged into. (View In/Out is turned off in Live by default)
That's how I assign the MIDI notes to the pads on an MPD or a 2500/1000/4000 or XL.
