Wiimamp to connect SMSL PO100 Pro, How can I use UAC2 mode?

[hoholan]

I use Wiimamp to connect SMSL PO100 Pro to my external DAC.
I use a USB-A to USB-C cable to connect them.
But I only can use UAC1 and cannot use UAC2 mode.
How can I use UAC2 mode?
Many Thank

 

[JAB]

I use Wiimamp to connect SMSL PO100 Pro to my external DAC.
I use a USB-A to USB-C cable to connect them.
But I only can use UAC1 and cannot use UAC2 mode.
How can I use UAC2 mode?
Many Thank

 

[hoholan]

I can only see the smsl light up and wiim app when UAC1 mode, but UAC2 mode cannot detect.
Is it anything wrong?
Thank

 

[jfbuk]

How are you connecting to the DAC and what are the make and model of the DAC ?

 

[pieterv1]

Until now WiiM still hasn't given us information about how USB audio works exactly - also with the WiiM Ultra. It is still unclear whether volume control commands are being sent over USB as well.