I've just encountered the same problem with my POD HD500 on Mac OS X El Captain Official Release version 10.11.
As you may know, I'm using HD500 as USB audio interface, I tried to record an audio track with Logic pro X, but I have no sound.
I think audio meter on Logic doesn't work right now.
Is there any solution for this and Is there anyone who knows the driver updated schedule from Line6 or Apple ?
Thank you for your help in advance.