What I'm wanting to do is mix together two audio sources, the (preferably amped) music coming from my iPhone, and the sound coming from my PC together into a single signal going out to the headphones, so I can listen to my music from my phone while still being able to hear my PC. I have this phone in a V-Moda Metallo case, docked with a V-Moda Vamp Verza amp (connected via Tuono cable) going out to V-Moda M-100 Crossfade headphones.
I have an iPhone 5s that I listen to music through (mainly Spotify 320kbps with some local 320kbps MP3s mixed in). I've been using this site for years to read about different headphones, amps and setups (this site really does stand on its own as an amazing resource) but have only just now come to a point where I need some help from the pros here at Head-fi.