Roscoeiii
1000+ Head-Fier
I have ordered this adapter from Aliexpress to see if it triggers the high gain mode of V10.
There are other options in the Aliexpress which might work (check the below links). We need to find the best option which doesn't alter the sound signature.
Remind us what headphones you have that require this.
Let's also not forget the Equilateral app mentioned a while back boost volume. May be less likely to affect the sound.
And remember that some headphones are not well suited to impedance changes. There is was a comment on why it would not be a good idea on 846s a while back.