Sony MZ-R55 Manual

The Digital PCLink’s volume and output controls can be accessed by 
double clicking on the speaker icon at the bottom right hand side of 
the Windows task bar. The volume for the Digital PCLink is set by 
the Wave Volume slider, which is the only slider that the Digital 
PCLink uses. If there are other sliders visible, go to Options and 
then Properties. In the bottom section of the Properties window, 
make sure a check appears only next to Wave Volume. Click on OK 
once you are done.

Before plugging in the Digital PCLink for the first time, you will 
need to ensure that your computer is running the necessary 
operating system and Apple Audio Extensions.

To verify that your computer is running the correct operating 
system, close all open applications. Click on the Apple icon in 
the top right had corner of the screen. Scroll down to the first 
item in the pop up menu called About This Computer and click 
on it. A window with details of the operating system currently 
running on your computer will now open. Verify that in the 
version line a number 9.04 or higher appears. If this, or a higher 
number appears, you are running an operating system that is 
compatible with the Digital PCLink. 
If you are running an earlier version of the Macintosh operating 
system, your Digital PCLink may not operate.