Hi,
I just received the Y-cable (TS+TS -> TRS) and I was able to run some tests.
1) Out 1 & 2 -> wired headphones: good audio quality, but you need to push the out gain to +12 dB.
2) Out 1 & 2 -> to Bluetooth 5.4 adapter -> BT headphones: same, no perceptible latency.
This solution remains very simple, not powerful, but perfectly functional and with stereo sound.
