The giant Fx-Know are Dry / Wet potentiometers.
X:FX – Is an externa- FX-Loop System (Send & Return) With Dry/Wet potentiometer for each channel.
You can connect the Xfx send / return with external Equipment for effects or looping.
Reverb devices, delays, samplers etc. can be fed directly from a channel, the signal is also brought back directly to this channel!
The EQ can also be applied to the effects, and what’s more, the filter can also be applied to the signal in the X: XF loop at the push of a button – this in fact only generally to all channels in which the filter is switched on.
For example, i use with an xone PX 5 an Alesis Air Fx for effects.