There is no Master Volume in the Crystals effect? Maybe you should be controlling INGAIN if you're want to add a small to a large amount of 'Crystals" with your expression pedal??? If so set your mix to the MAX amount you want when you INGAIN is maxed (Toe posistion on the EP ).
This may not be what you're after but it kinda sounded like it to me..... sorry if it's not.
This may not be what you're after but it kinda sounded like it to me..... sorry if it's not.