1) Within the StreamMagic app, open the unit's Settings.
2) Scroll down to Tone Control, and press Off.
3) This will prompt the Tone Control window, enable these controls.
4) Adjust the Bass and Treble by moving the sliders +/-10. Once you've settled on your desired adjustments, select Done. These will now be the default Tone Control settings for all sources of the EVO until either adjusted or switched off.