And you have it set up correctly as shown here. https://www.eventideaudio.com/support/downloads/setting-prepost-routing-options-h9
Also for everyone else, the H9 is designed for -10dB input levels. Which is guitar levels. Most amps especially tube amps are +4 to +6 dB and will overload the H9 input. Now if the loop has adjustable gain. Settings you are good to go.