How To Record Guitar With Exact Timing

hi,

it has been so long since i write here (and it was with another account i beleive). i hope everybody is ok and doing great things.

now about my question:

recently i saw a video:

http://www.youtube.com/watch?v=er9VhozNHNk

his timing just blow my mind. i mean everytime i try to record and loop something there is a little disposition at start. i know it may be because of my latency but rather that how can i reach that level? is there any exercise to do that?

thank you

About Acoustic Guitars

Hi,

I have question in my mind for a long time. I play guitar for some time and i dont have any trouble with barre chords with my electric guitar. But when i tried to play barre chords with my acoustic guitar, after few minuets my right hand starts to aching. especially with higher notes (F F# B Bb etc). what you think of this? is this because of my positioning is wrong? or i need ignore the pain to practice more ? or its just because of my guitar is very poor quilty?

thanks