IanP1

Have a look at the online manual for connections with the Helix Stadium https://manuals.line6.com/en/helix-stadium/live/quick-start Plug the output from the Stadium L mono into the your Katana Gen3 power amp in to use it as an FRFR cab (powered speaker). Plug your guitar into the instrument input of your Stadium or if using a microphone to get your guitar sound then use the mic input. The L mono output from the stadium into the Katana is the only connection it requires do not plug your guitar into the Katana guitar input connector. Guitar into Stadium and its effects are then output thru the L mono to Katana and thats it!