After registering and connecting your Gear with the AvengersNet App, you can change the volume level on your Repulsor right in the app!
After connecting to the app, you can use the following steps to adjust the volume:
Tap the green Repulsor icon in the top right hand corner of the Avengers HQ screen.
Tap the small Gear icon that appears in the submenu.
Tap and drag the Volume slider to a level you're comfortable with, then test your sound level by pressing the thumb trigger on your Repulsor Gear.
Learn more about adjusting the volume through your Repulsor Gear here.