An odd feature of the 2 outside channels

Hi all, I primarily bought a Prime 4 as I wanted to connect turntables to the outside 2 channels, which I have done. Something I find very strange however, is that the Effects do not work at all I the turntable channels. The FX 1/2 selecter disappears so I can’t use those, and all 4 of the Wash FX buttons do ‘Filter’ regardless of which one is pressed.

It’s weird and I can’t work out why it would be a ‘feature’. Any ideas?

FX don’t work on line/phono input sources (yet).