6 of the 9 effect channels (the left and center columns) in the iOS app and 6 of the 8 effect channels in the Android app can be set with your preferred effects.
Tap [add] and choose your preferred effects to assign them to an effect channel.
You can switch between assigned effects with a long press of the effect button. Tapping the [BACK] button after long pressing the channel will result in the effect being assigned as CHR or PinP*
*See related effects pages for more details