This is not all specificly about axoloti but also other hardware but I feel this is still a good place to ask some questiones 
I'm doing a little guitar travel amp project, with axoloti embedde into a little speaker box.
as preamp I'm using only the amp part of this cheap thing:
It's based on a TDA2822 chip
TDA2822 Stereo Audio Amplifier Circuit
I tested going from the HP out of it straight to axoloti with -12db input gain setting, it worked well.
Then I go into this little poweramp:
My question now is:
The tda amp as some capacitors after the chip and a resistor before the headphone. Could I also grab the signal directly from the chip? In the spec sheet it seems as like the capacitors are for driving speakers, but I want to go into axoloti and then use a different power amp.
I tried going to the amp from the Headphone out. It gave me a lot more output volume, axoloti's line out was a little bit too quiet for the amp. Is this a good Idea?