Hi, I am using the gsc3 to control the Helix Stomp and an amp in 4cm.
The order is like:Guitar—> GSC3—>Input Helix The rest is the 4cm as discriped in the manual.
on the GSC you will have to define your presets incorparating looper, Midi and/or switch scenarios.
If you wish to controll the Helix via Midi, keep in mind that the GSC3 is sending PC always +1 ( as discriped in the manual GSC3/2). For example you wish to switch to the Helix-preset with PC117. Then the GSC 3 will have to send PC 118.
Hope this helps...