[matthewacbroad]

Here is the issue I'm facing with my E7. If I use the AUX input say on the go, it works fine in stereo mode. However when I enable USB mode, only left channel works, until I put a small flat head inside and move it around, after few seconds I can pull it out and both channels work.
 
Is there any fix for this. I think it has to do with the AUX jack itself, because moving the flat head around result in fuzzy/cutting in-out right channel. When you pull it out a few times it works.

 

[matthewacbroad]

If anyone else has this problem I think it's due to the input jack having damaged switch (switch from USB to line-in modes). Already got X3 so there was no use for portable amp.
 
Fixing this issue = Replacing/fixing line-jack OR Removing jack w/ soldering points together (L+R) to always enable USB mode.
 

 

 
 
After removing , this device will always stay in "USB" even after you unplug the cable Thus making it a PC sound/amp only with 2 outputs. This device is my primary sound card.