So, I had the idea of getting the BPM time from my DAW (Live 8 ) and using a [realtime] to turn it into a number for [metro]. Just made a MIDI clip, and sent it in to PD. Thought it would be handy enough, but I'm getting different numbers around what's expected every time I run the clip. Latency, maybe? Any ideas? Was pround of my idea until it ended up not-quite working 
. Patch included. Running Extended 0.42.5, Windows 7 with MIDI Yoke, if any of that is of any use.
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BPM.