CTRL49 setup in Pro Tools, "ARP" not synced

Hi, I can't manage to syncronise the CTRL49 Arp with ProTools clock. I setup my CTRL49 to "External" and ProTools with MIDI Controllers "HUI", "CTRL Mackie/HUI", "CTRL Mackie/HUI". As soon as press ARP and play a Virtual Instrument from the M-Audio, there is no sound.
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