I used the iscan soft ware to turn up the earphone volume to max than it can be adjusted with volume tab on the pro 107. I haven't found an place in the 107's settings on the unit to do this,just through the iscan software. I will admit the software takes a little bit of studying,but, who doesn't like to learn new ways of doing things. Great scanner,I have had NO problems.Remember to hold the menu down when updating firmware[read booklet].