Recording volume changes

I have searched the forum and the manual, but Im still not clever about this:
Can I record realtime volume changes after having done the original sequence recording?
I can record volume changes in my external soundmodule (miditracks) - this the MPC accepts, but how do I record volume changes in tracks where I use the mpc samples (drumtracks)? Can I use an external midi controller for this - and is this the only solution?
I know I can edit volume changes in step recording, but its not so straightforward.

I guess this covers one of my questions:
http://www.mpc-forums.com/viewtopic.php ... ck+mpc1000

But the other question was: Can it be done by using a midicontroler after having made a sequence and THEN record (over dub) volume changes in the different MPC drumtracks?
Fx. midicontrollers like: Behringers B-CONTROL ROTARY BCR2000, or Doephers POCKET DIAL (http://www.doepfer.de/pd.htm)

Moogens wrote:I guess this covers one of my questions:
http://www.mpc-forums.com/viewtopic.php ... ck+mpc1000

But the other question was: Can it be done by using a midicontroler after having made a sequence and THEN record (over dub) volume changes in the different MPC drumtracks?
Fx. midicontrollers like: Behringers B-CONTROL ROTARY BCR2000, or Doephers POCKET DIAL (http://www.doepfer.de/pd.htm)

Anyone got the answer? Is it possible at all to change the levels of drum tracks with a midicontroller?