There has been a noted change on PUI Part AW-15SBR Digi-Key Part 668-1254-ND. When looking on the Data sheet they show a potentiometer to the right of the DIP switch. This has now been updated and is using a Hi/Low switch.
In speaking with the PUI engineering team I was informed that this switch is the volume ‘VOL’ control. Up is high, down is low. They are still working on the drawing for the data sheet, but no other information will change other than the diagram.
In the picture you can see the VOL switch is part of the DIP switches.
As soon as an updated data sheet is available this will be posted on the Digi-Key product page.