#1
the guitar with an edge pro came with 9s, and I've decided to change them since I often play 10s.

Would this require any adjustments of the truss rod or an additional spring, or will there be little difference in tension?

Thanks in advance,

Victor
#3
You will need to adjust the springs in the tremolo cavity, although three springs should be sufficient. Your neck will need adjustment, and your tremolo action won't be as smooth.
My name is Tom, feel free to use it.