Honda CRF1100A 2021 Owner's Manual page 104

Instruments
(Continued)
Volume
Selects the volume setting to automatically
increase volume from the headsets as the
speed of the vehicle increases.
98
To [Off] (disable), [Low] or [High] auto volume
function:
Select [Volume], and then press the
!a
switch.
Select [Auto Volume], and then press the
!b
switch.
ENT
Press the sel up switch or
!c
switch to set your selection.
ENT
sel down