Moog Etherwave Pro Theremin

Hi All,
I am new to Theremin world. I recently bought Moog Etherwave Pro Theremin. I like to know how to connect it. It has two ports, AUDIO and Phones. I have Fishman Guitar amp and Yamaha PA system 600i.
If I am right, the guitar cable should connect with audio port on theremin, where should it be connected on Guitar Amp or if not guitar amp, where it should be connected on Yamaha PA system. 
Please help me out. I will appreciate for your help.
Thanks
Raj

That’s most probably an Etherwave Plus, the Pro model has been discontinued more than 10 years ago. It has line level at the audio output, so it risks to overdrive most guitar amps. A keyboard amp or an active studio monitor speaker can better deal with that. The audio cable will thus link the audio output of the Etherwave to whatever line input.

All this information is also given in the user manual which comes with the Etherwave. 

BTW: I edit your above post to eliminate the abusive font sizes.

Thanks a lot.