Okay guys, I have some pretty exciting news to share: it looks like there's a way to share external hard drives with an Android device and have the files stored on the hard drive play through USBPP and output to a USB DAC!!! I just got it working and wanted to share! (If someone has already done this before, then please excuse my excitement-- but this seems to me to be a method of getting access to vast quantities of music at high quality while on the go, and unless I've missed it this hasn't been accomplished yet).
Current Setup: FLAC files on a WD 1TB external HD >>[standard USB]>> Ravpower FileHub >>[WiFi connection]>> Nexus 7 Tablet (USBPP & MobileFun) >>[micro-to-mini USB OTG cable]>> iBasso D-Zero DAC/amp >> ASG-2 IEMs
Basically, the Ravpower FileHub allows you to plug an external hard drive into its USB port and it will both power the drive and read its contents. The MobileFun app then allows you to access any files that are stored on the hard drive wirelessly-- which is critical for our purposes, as the USB port will be used by your DAC. At that point, after you've set up and connected the Ravpower (which takes a few minutes and isn't dead-stupid simple, but isn't super difficult), you can browse the files on the hard drive, select USBPP as the default application, and (assuming you've already plugged in and connected your USB DAC), you can play the files stored on the hard drive through your external USB DAC.
As I'm a bit excited and somewhat scatterbrained at the moment, I'm going to try to break everything down into steps to make it easier:
Things You'll Need:
Android device compatible with USBPP
Ravpower FileHub (Amazon link)
External USB hard drive (and USB cable to connect to FileHub; I'm using a WD 1TB external HD [model WDBABM0010BBK-00], although I believe you could use any number of USB hard drives, not just this model)
External USBPP-compatible DAC
USB OTG cable for connecting DAC to Android device
USB Player Pro Android App (Play Store)
MobileFun Android App (Ravpower Site)
Download and install USBPP on your Android device
-Connect it to your USB DAC and ensure it can play local files from your device
Download and install MobileFun on your Android device
-Connect your FileHub to your Android device via WiFi (there is a manual that comes with the FileHub that walks you through most of it)
-Complete the setup process and make sure you're able to browse files stored on your hard drive via the MobileFun app
Open up the files you want to play in MobileFun, choose "USB Player Pro" as the media player you want to use, and voila!
We now have the ability to use our Android devices as media renderers and sources for terabytes of externally-stored high-resolution music while on the go, and can listen to music via pretty much any damn DAC or amp we want!!!
Again, please excuse my excitement and the disorganized nature of my post-- I've just been wanting to try this for almost a month, finally got a chance to do so, and am just STOKED that it's working!!
I'm going to cross-post this in the USBPP thread as well. Looking forward to seeing how it works for others!!!!