Most balanced headphone cables don't support microphones? So I wonder if the software is using the wrong signaling pins.
I do not think that's the reason.... Most balanced headphone cable is analog cable, so it is totally different story.... balanced cable do not need any software....
the reason why balanced cable do not support microphone is they need to use all 4 pins of 3.5mm headphone jack.
Most common one is unbalanced 3.5mm 3-pin(no mic/volume controller)
It uses
1. Left unit signal
2. Right unit signal
3. Ground for both left and right unit
but typical mic/volume controller 3.5mm 4-pin jack(mic/volume controller)
1. Left unit signal
2. Right unit signal
3. Ground for everything.
4. mic/volume controller (if your DAP/smartphone is not compatible with mic/volume controller, then it is okay. #4 is not being used so mic/volume controller won't work but 1,2,3 works fine, so other than mic/volume it works fine)
and balanced 3.5mm 4 pin jack would do
1. Left unit signal
2. Right unit signal
3. Ground for left unit
4. Ground for right unit.
And this is reason why it does not have a mic/volume controller. It is already using all 4 pins. and it is not compatible with typical 3.5mm device.
To make it work, you need to make it as a 5 pin design, which means it won't be compatible with any device except proprietary
If not all, absolutely most mic/volume controllers in 4 pin 3.5mm jack cable is for smartphone, because that's the biggest market.
And guess what, 5 pin cable will have ZERO compatibility with any smartphone. That's why we do not see balanced cable with mic/volume controller most of time.
But Capri do not uses 3.5mm jack, as you know. The key difference between typical balanced cable and Capri is location of DAC.
Typical balanced cable means, your DAC is in separate DAC or inside of DAP, and to keep purest signal, you intentionally not sharing ground unit between left and right.
If you share ground, then it will save cost, because your cable need less strand, but balanced cable is simply not doing it for sound quality.
On the other hand, Capri puts DAC on the cable, especially where cable starts to divide into left and right.
AAW advertised balance cable is such a big deal, but to me Capri is just naturally became balanced cable, because DAC is located on Y splitter.
It is even harder to make unbalanced cable with this circumstance here, because you gotta divide cable into 2 pieces someday; one is for left and another one is for right, unless u wanna turn on only one of left or right unit.
and if you put DAC on where cable starts divided, then it will be naturally balanced cable. BOOM.
It's likely they failed to putting good quality DAC in small form factor.
No wonder; they are not a gigantic company like Apple, though it is still very disappointing.
Dealing with a small chipset DAC without large quantity order is hard without putting high price tag.