Level indicator version TPA3116_100W/D class digital desktop amplifier

This project reproduces the TPA3116 desktop power amplifier with filter capacitors, with some personalized adjustments.
The original project: The TPA3116 desktop power amplifier
is based on the original project, with the following adjustments:
In order to adapt to a radio frequency transmitter shell bought by Laowujia, the overall size and Connector position;
the channel indicator LED opening function on the front panel of the casing is replaced with a volume level indicator, which is implemented using the IC-KA2284 chip;
a NE5532 is added to mix the two-channel audio signal and output to the IC-KA2284;
adjust the PCB Stacked into a 4-layer board, adding a complete ground plane and power layer, it has better noise control;
two versions, V2 version single chip 100W, V3 version dual chip 200W (please add a heat dissipation block to export the heat to the casing) ;
Actual picture:
 
Note: The noise floor of the digital power amplifier has a lot to do with the power supply. Currently, I am using a Samsung professional audio power board 24V/5A. When the volume potentiometer is turned to the maximum, the noise floor cannot be heard.