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TAS5431Q1EVM: audio not playing

Part Number: TAS5431Q1EVM
Other Parts Discussed in Thread: TAS5431-Q1

Dear all, 

I am trying to set up the TAS5431Q1EVM to run some tests. I followed all the instructions listed in the user guide as shown below:

I manage to connect my desktop to the audio, and have the status 'playing':

my desktop is properly connected to the EVM:

However, there is no sound playing. Does this device actually need an external anglog audio source wired on in+ and in- ? If yes, what can be used ?