[starsailor]

Intonation, I'm out of my comfort zone here but it's fun, you play an open string and then fret the string at the 12th fret and the two should show up the same on a tuner or ie open E and E on 12th fret, I've just done it on my guitar and it works although my intonation is out on the E as my saddles on it's last legs, the A was fine though, the 12th fret is the centre of the guitar measuring from the nut to the saddle, think that's right, I'm reading up on it and there are loads of variables to consider when setting up a guitar but I have tried to keep it simple to be honest some of it went over my head but it is Sunday and my brain has a half day on Sundays.

On the other question that appears to be a minimal adjustment affecting string height and therefore length of strings between saddle and nut I'm assuming they mean moving it up or down a tad to achieve the perfect tune, it would though be a very minimal move
I haven't used one of these Carol but they seem to be well thought of.
What does your base lefty piece consist of Carol sounds interesting, look forward to hearing it, my progress is slow and I have all the grace of a Giraffe on an ice rink, I might be able to practice yours or I've got a simple thing in D I might be able to do, my lefty guitar doesn't sound half as good as my Yamaha I might convert my electro acoustic as it's a cheap encore but I'll have to think about that, It does feel a bit crowded playing with the left but it must be our brain saying it's not natural.

Best Wishes

Chris