Glad to finally have an H9 on my pedal board. I have connected it to the Line 6 Helix via the FX Loop 1 and also connected Helix MIDI out to the H9 MIDI in. I am getting very strange behavior when the MIDI cable is connected. When I disconnect it, the behavior stops.
When the MIDI is connected, the H9 output volume is incredibly low, but the input volume is good. I have to set the Helix FX Loop Input and Output to +6Db and set the patch on the H9 output level to +20dB. It is still very quiet.
As soon as I disconnect the MIDI cable from the Helix the behavior completely stops and the output level on the H9 is right where it should be. I have to set the FX loop input and output levels back to 0 and set the H9 output level back to 0 otherwise to quote Huey Lewis…”It’s just too darn loud”.