MPC 2500 JJOS XL Multi Tracking problem

Guys, really need help here! I bought yesterday a multitrack recorder, korg d888. Until now, i'm satisfied!
I have a beat that i'm trying to multi track out to the korg. I pressed mode+pad4 and went to the menu where you assign your tracks to your mix outs. I have 4 tracks, 1- Main sample, 2 - Hihat , 3-Drum break loop , 4 bass.
All of these come fine to the korg, except nº3 (drum break). Tried assigning it to another out and so but nothing... Can anyone help me?

2 things I can think of.

a) The sample is stereo, I know that JJOS128xl is okay sending stereo samples through a mono out, but I'm not not sure about JJOS-XL


b) an issue with your outputs on the MPC or the inputs or even a cable

1) - Try assigning another one of the tracks to output 3 - does it record? (yes.. look at what I have said above, no then maybe an issue with the output or the cable you are using)
2) - Try running a cable from output 2 of the MPC to input 3 of your recorder.. does it record?