Hi: The explanation for slaving an external MIDI device to PT is in Chapter 35 of the PT Reference Guide. Basic steps are enabling MIDI Beat Clock and identifying the device to send beat clock to (MIDI->MIDI Beat Clock) and putting PT "online" (Operations->Online). Of course, the Triton needs to be setup to sync via external clock and you need to enable MTC in AMS for the synth so that PT knows it can receive MIDI Time Code. This is the only way, for example, to get a loop in the external sequencer to sync with PT. Like the other guy said, if you are just trying to play back a sequence, it's far more effective to get the sequence into PT and just trigger the synth with normal MIDI messages instead of trying to start playback from PT.