Cirrus Logic CRD48L10 - Manual (Page 28)

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4.3 Monitoring Audio
4.3 Monitoring Audio
By default, all audio outputs of the CRD48L10 are active. Any of the outputs listed in Section 2.2 can be connected to a
speaker or headphones with compatible impedance characteristics.
4.4 Selecting Audio Input Source
The S1 button or rotary encoder knob can be used to select an audio source. Input options are described in Section 3.1 .
4.5 USB Control of CRD48L10-4in4out
The USB1 connector does not provide USB control of the CRD48L10-4in4out. The CDB-MCU-DEBUG board must be
connected to JP2 to give USB control of the CRD48L10-4in4out.