You
can use the
Volume buttons on the
remote control to adjust the volume as you project a presentation
with audio.
You can also use the volume buttons on the
projector's control panel(EX5240/EX5250 Pro/EX7240 Pro/EX9200
Pro/VS340/VS345).
The volume buttons control the projector’s internal speaker
system. You must adjust the volume separately for each connected
input source.