There are a few other things that I didn't see mentioned:
- There is a global setting that needs to be changed based on whether you intend to use the unit to go direct, plug into an amp, or plug into a power amp. Even if the amp and cabinet sims are turned off it seems there is additional tone shaping going on. Press and hold the View button, go to System Setup, page 4: "The Mode setting on this page allows you to configure the type of signal fed to your POD HD500X analog outputs to optimize for direct recording versus connecting to an external amplifier. "
- There is a switch near the expression pedal that indicates whether your 1/4" out is intended to go direct or into an amp. This should be set to "amp" as well.
I can't vouch for whether configuring these additional settings would end up making it sound good through an amp, I can only vouch for the existence of these additional settings. When I first got this I tried going into my amp just for kicks and it sounded terrible. That's when I looked at the manual and took note of the global settings, but since I use this to go direct I didn't want to change my global settings so I just left it at that.
Is it as good as a tube amp with stomp boxes? No. Do it get decent tones out of it by going direct? Yes, after a whole lot of knob tweaking. Is it easier to carry and more consistent than an amp and pedals? Heck yes.
Hope this helps.