Looked in the manual and it said about the tuner button............

This launches the Guitar Tuner, which lets you tune a guitar or other instrument plugged into the mic-in or line-in of soundcard.

so the tuner itself has changed - it used to appear and let you play tones to tune to that came out of the speakers. now it seems to respond to mic or line input like a hardware tuner.

that means i was right about needing to plug in a guitar. Andrew - has it changed? anyone else remember the way it used to be?