This is my PCB project, but still brainstorming if I can improve in order to ease the connection, especially with the Yamaha SWLL YMW830-V. It would be nicer to have a 0.65mm pitch kind of header or connector, instead of wires.

Here's a first (and old) proposition for the PCB : https://www.youtube.com/watch?v=z9ano9jffsM

The newer implements the pads for the 1.27 2x4 pins header
The PCB has pad jumpers in order to be able (when using two PCBs, stacked one on the other) to recreate both LEFT and RIGHT channels. Normal use case is to feed the existing Head Phones amplifier (RIGHT Channel input) on the PSS-A50 PCB with the OUT R +/- of my PCB.

Target is to connect it between DACRPP/DACRMM and R+/R- inputs of the HeadPhones amplifier IC601.
Power Supply will come from +5V and GND under the normal size cap C035 (+5D / AGND) located on the right of the 3.5mm HeadPhones Jack; near the screw.