So better or worse, I bought a Mooer GE150. This is actually a pretty decent sounding modeler/effects box and they are dirt cheap on eBay. I also got a used Powercab (non-plus). The two can sound great together, but not nearly loud enough for most patches. I can't find documentation on the topic, but it seems the Mooer is intended for "amp" or instrument level output and has no setting to change it. I measured its presets at -22db to -24db and of course the PC will be very quiet at those input levels. If you crank everything up in the patch (gain, boost effects, amp volume) you can hit -16db and it sounds pretty good through the PC, but I could never get clean sounds past -20db. Long story short its a digital modeler without enough clean headroom (lol).
At first I figured I'd just try to sell the thing and get something capable of producing the right output but it *really* does sound really good and gets a real AITR vibe going with the Powercab, so I'm leaning more towards trying to make it work somehow. Has anyone dealt with something similar? I'm considering a clean boost or maybe graphic eq pedal. Its hilarious because some of these will cost almost as much as the Mooer but anyway I'm considering things like:
Xotic Super Clean Boost - https://www.sweetwater.com/store/detail/SuperCleanBuf--xotic-super-clean-buffer-pedal
MXR 6-band eq - https://www.sweetwater.com/store/detail/SixBandEQ--mxr-m109s-six-band-eq-pedal
SparkMini - https://www.sweetwater.com/store/detail/SparkMini--tc-electronic-spark-mini-boost-pedal
I kind of lean towards an EQ with a decent amount of boost since the Powercab has no EQ of its own and it could be handy to make a quick global EQ change depending on where I'm playing or how its setup.