The Arps feature of the TE only work if the TE is the master. If you are using the MPC as the master & the TE as slave, you will not be able to use the arps the way that Korg wants you to. There are other ways to get them to work but its to lengthy of a description. You can do it, but only at the bpm/tempo of the master unit, ie MPC. I hate to say it since it's so cleche around here, but the manual would really help you with this.
However, you can be creative. Remember the TE & the MPC both have samplers in them. Hint, Hint!
