ripov,
last Guest - why do you tune between songs? Surely its easier to hear that you're in tune or not while you're playing? (except when using high levels of amplification) And if the next person you play with is out of tune with you, and you both use tuners, then the tuners are at fault. So the question is - how do you ensure your tuner is in tune with everybody elses?

I don't think I entirely understand your question, but I'll give it a go.

1. I don't tune between every song. But I probably should. The guitar goes very slightly out of tune in the course of playing a song.

2. I use a capo a lot. When going from open strings to having a capo on the 5th or 7th fret, the bass strings go slightly sharp. A quick touch-up of a string or two takes almost no time if I don't have to fumble around picking up my tuner. Most performance situations I'm in are noisy enough that trying to tune by ear is ill-advised.

3. I occasionally tweak a string that's way out in the middle of a tune, but since I'm the sole accompaniment the music dies if I stop playing. I can do a spontaneous arrangement change and make a space for me to tune in if I need to, but since I tune my guitar and cittern pretty regularly between songs, they are rarely all that far out of tune.

4. Everyone I play with except fiddle players use tuners. We're always in tune with each other -- there's never a problem with tuners being out of tune with each other. Fiddlers usually get an A from another instrument and then tune the instrument to itself. Most are pretty good at doing that very quickly.