I am new to helix, I have a guitar with the ability to spilt my pickups. I have sucessfully routed my front pickup to return 1 and my bridge pickup to return 2.by programing the inputs accordingly I have built sounds that mix things like chiming delays on the front with distorted flanged sounds off the bridge. (thing I used to dream of). Is it possible to use the expression pedal (I tried without sucess using the pan block) to control how much of one channel is mixed with the other. I have been able to use the volume pedal to control one channel but I would like to mix .increase one and decrease the other while maintaing the same volume live. I am going out of the helix mono. I am a newbee to helix and any suggestions are welcome.