Yamaha RP-U100 Owner's Manual page 62

Opening Page
Setting the USB Mix Level
Audio signals from the computer supplied via USB cable can be mixed and
reproduced by the RP-U100 even when an input other than USB is selected.
Audio signals from the computer connected via USB cable will not be heard while input
sources other than USB are selected.
Audio signals from the computer connected via USB cable will be mixed with input
sources other than USB.
DSP sound field programs affect only the sound from input sources other than USB,
not the audio signals from the computer.
Drag the slider towards MAX to increase the mix ratio of audio signals from the
computer connected by USB.
Dragging the slider towards MIN decreases the ratio of audio signals from the
computer.
(A appears at the default setting.)
Changing the mix ratio does not affect the level of source other than USB.
Setting the Max Volume Position
This determines the upper volume limit that can be set with the application.
The setting can be between 50 and 90% on the volume indicator.
Drag the slider left or right.
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