The purposefully re-designed Audeze HQ app allows you to control both Audeze Maxwell and Penrose headsets, and customize functionality of the headphones. Audeze HQ connects via Bluetooth, and your customizations travel with your headphones, so once you've set the parameters they stay in place until you change them again.
The Audeze HQ app features a 10 band equalizer that lets you apply EQ adjustments to any audio you play. The app allows you to save EQ curves as presets, toggle side-tone on and off, and when connected to XBox or another supported device, change the game/chat mix.
For Maxwell, Audeze HQ has additional controls such as voice prompt levels, and even more EQ presets (6 predefined, and 4 user defined).