Is there such a thing as an Amp Selector, like a Speaker Selector, something I can selector different amps?? like I have three amps and I want to selector which one thru my guitar...

Morley makes one and so do other companies. You plug your guitar into it and then the other lines go to your amps. What ever amp you want the signal to go to, step on the foot switch. The signal will go to that amp and the other ones at the same time if you want. it is called a ABC box. Hopes this helps you

http://www.tonebone.com/re-bigshot-aby.htm

Very high quality stuff.

Hi I have used the Boss LS-2 to switch between two amps and combinations of both, plus I seem to recall getting a dry signal out as well (to third amp?)

Regards

yes, there are some ways to do it... check how Steve Vai does it...