midicontrol to ableton live6

ok this is problem:

i connect midi out a(mpc1000) to midi in (m audio delta1010).
i open ableton live6 , open an instrument(operator-kickdrum)midi from i set to
channel 1.and set monitor to in.

now i set the mpc track 1 to midi(out) ,pgm:off,midi channel 1a.
now i edit a 4/4 beat on every 1/4 note(bpm160)....so that the mpc sequencer plays the operatorinstrument in ableton live6(like soundmodul)

normally we would listen a thight (in correct timing) tekno beat----
but no-----we listen a totally incorrect timed 4/4 teknobeat----LIKE THERE IS A SWING SETTING ACTIVE.

i hope my english is not to bad...

cheers
steph

thx for your help....
in the end it was a question of samplebuffer size -it was set to 1024 and i had a latenz of 70ms.
now its set to 128 -256 and it works fine ....