Interesting. The manuals don't have that info.
On our 2014 Allegro Bus 37AP, top right lever is radio volume. Another lever controls the station, I believe. (I'm not at the MH, so I can't play with the controls. )
Headlights are controlled be turn signal. You can flash them (to tell the 18 wheeler they are clear to come into your lane after passing you) with the top left button. Top right flashes the marker lights.
2014 Tiffin Allegro Bus 37AP