freemate DA-275, Owner'S Manual

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[13]
2) With the above adjustment if the
volume is still too low or high,
adjust the volume of soundcard in
computer.
3. Operation
1) To make an Internet phone call, a
telephone call, listen music from
computer and other audio device
at the same time.(DA-275 ONLY)
Press TEL/PC button for internet
phone call, telephone call,and
computer music (or audio).
Adjust PC listening volume controller
for optimal sound and dial after tone.
You may need to adjust your
soundcard volume in Computer for
optimal performance.
In this case, the music does not
transmit tothe caller.
* Notes: In depressing Tel/PC button, it
can work only for telephone use.