I love my Kemper, but I think it's compressing bass frequencies. I noticed it a bit for guitar, but now that I've profiled my Ampeg SVT VR I can hear the differences more pronounced;
https://soundcloud.com/matt-sinrod/svtvr-amp
https://soundcloud.com/matt-sinrod/kemper
Don't get me wrong, it's 90% there, and that's amazing. But...I'm wondering if anyone else hears this. Could be user error on my part during profiling.