Originally posted by Bill Norrie:
I understand what you are saying Alec, but not all guitar amps have the Line-out/ effects-send facility
I have two guitar amps - not too ancient - and neither has this facility.
Why use an extra bit of kit, when it is just possible that perfectly adequate results may be obtained by using the mic input?
As I said before - give it a try 
I have, and a line feed is superior.