I have this problem too. Using Win 10, Reaper, PodGo all patched up, using it for a bass. I found a fix. Previously I was going into Reaper and 'Normalizing' the wav file that came in kinda weak (somewhere between -30 and -24 db for me). It was usable, but required extra steps each time. I searched everywhere for a USB output level setting. Could not find it. So...
If you go to the Pod Go's Output Main Out (the last thing in your signal chain that is selectable after all your effects), increase your output here and you will see your USB output level increase in Reaper (verify with the Mixer or track level indicator). At +20db (maximum Pod Go output), my input to reaper went up to about -6 db. A little hot, but this can be knocked down a bit as needed.
I am thinking for my favorite patches, I will probably make this a snapshot so I am not always at maximum output when not recording. Hope that helps someone. I couldn't find this answer anywhere else.
