Psycho_Dog

Hi Guys. I am a first time Helix LT user and having a lot of fun (and a few frustrations) in getting the Helix fully set up. I would really like to have the helix control the Reverb on my new Roland JC-40 amp, but haven't had any luck so far. I have gone through all of the settings and tried the command centre etc etc. When I plug my fender reverb / vibrato 2 switch pedal in to the amp, the vibe switch turns the reverb on/off per each click. When I plug a cable (1/4 guitar or TRS) into the ext. amp out on the Helix and into the reverb switch in on the amp, all I get is hum. What am I doing wrong here?? The Helix manual is useless. The JC40 manual says I can use Boss FS-5L footswitch (latch type switches) if that gives any clues, but obviously I would like to do this switching through the Helix it would be magic! If someone can assist or point me in the right direction that would be a great help. I have done a few searches here and have turned up nothing I could use at this early stage. Thanks.