I have a pretty simple rig, my iPad air 2 with auria. I use an irig pro interface, it's just me, I mic my acoustic, and electric, bass and keyboards are direct in. Drums are played on the keyboard. I have a set of focal spirit pro headphonea. I don't really have anywhere to set up a treated room, nor the $$$ to spend on it. No need to have multiple headphone feeds. So, my question is, will an external headphone amp provide me with any noticeable audible difference when mixing?