How to record MIDI arpeggio notes from TI2 to MPC 1000

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My system is: MPC1000 (JJOS2XL), mopho synth, Virus TI2 desktop

Connections:
mopho OUT --->IN 1 MPC
mopho IN<-----OUT A MPC (channel A1)


TI2 OUT ---->IN 2 MPC
TI2 IN <----- OUT B MPC (channel B4)

So I want to record arpeggio notes from the TI2 on a MPC MIDI track. I use the mopho keyboard to play the Virus.
When I press the mopho kbd I get the TI2 to play and record MIDI notes from a typical TI2 patch. BUT when I try to record arpeggio notes from a TI2 patch with arpeggio, it just doesn't work !!! I get 3-4 notes from the arpeggio then it stops. I suspect a MIDI loop but I am not sure.

How can I make this work