also, you said,,, I added reverb to FX1,
that is impossible.
you don't add reverb to an effect,
you "SEND" dry audio TO the FX1 slot, that is wh9en th9e effect (reverb) will get that audio and make it sound reverberated, only when you turn up the OUTPUT of the reverb channel (reverb return) will you be able to hear reverb.
If you have no previous experience with audio mixers, there is a lot to learn, the first thing is you must understand what we call "signal flow"
it is all just plumbing... this gets routed (piped) into this, then that get's routed (piped) into that,.... and so on.....
Input channels "receive" audio from a connected sound source. Even if that sound source is producing audio, and connected, the input channel will not get that sound unless it is routed to that exact input.
"Outputs" of audio producing devices such as microphones, keyboards, guitars etc., always connect to inputs of audio gear, (mixer) and "inputs" of audio gear like your mixer "receive" audio "from" sound sources
outputs connect to inputs
inputs connect from outputs
out to in
in to out
never input to input,
or output to output