Sorry, I don't own an amplifier or the Xiegu X1. Is it the Platinum edition? How much did you get it for? I see it selling for $280 at the 446 store. http://www.446shop.com/Product/Pro640.html
I think that is a very good price for all the features it has.
It's an X1M Platinum. I got it on EBay for $195 plus shipping from W7CKW. He said he had bought a KX3 and therefore hadn't used the X1M much.
The amplifier is the Chinese MX-P50M (I goofed earlier and said MX-p50A, a similar amp). Here is a link to a test/review: https://vk2qr.wordpress.com/2014/11/25/mx-p50m-hf-amplifier-review/
I suppose if I have to I can just key the amp with a foot pedal switch, but it would be nice if I could get it to key up automatically with the radio's PTT...