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Just in case you get to that point, here's the link to those manuals on the Yamaha website. Another option might be to upgrade to Logic, which does output MIDI Clock, though you'd still have to poke around in the P-125's manuals/utility pages to find the settings for external sync. It might be easier to just record the audio in un-sync'd, and try to use GB's Flex to telescope warp it to the correct Project Tempo. All told, it seems that if it is possible it may involve the use of some extra software, and a fair bit of poking around in the keyboard to suss it out. Couple that with the uselessly cross-referenced set of impenetrable manuals for the P-125 - they seem to suggest there's an option for slaving to an external clock, but I couldn't find any specific instructions as to where to go to set that up. There's a real lack of definitive information on whether GarageBand outputs MIDI Clock - nothing in the Apple docs, and the general consensus seems to be no MIDI output. MIDI sends messages to tell something else to play a sound.
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If you 'record' MIDI into your PC, you will get the sounds your PC makes (probably from a sub-standard audio/General MIDI soundset) and it won't sound anything like the actual P155 piano sound you want to record. I'm not sure if that's going to be doable without the law of diminishing returns kicking in. Remember that MIDI and audio are different.
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