Optimization for use with external DACs

[fermelom]

Hi.
I'm using Neutron MP in a Samsung Galaxy Note 2. In devices that runs the latest versions of Android is possible get audio output from the usb connector, actually I'm using this function with a portable DAC/Amp (Pico) and works fine but I'm not sure to getting the best performance cos I'm dealing with 2 volume controls (the player and the amp) and also I'm experiencing some shortcuts in the audio (not sure if it's caused by the use of the usb connector). I'm suggesting that you could include a function to optimize the performance when you use a external DAC or DAC/AMP.