Ever since the Stage was released the firmware has been buggy, but what really stinks is that it's not just the Stage, my KPA Rack (which was rock solid until the Stage was released) has buggy firmware too. My last issue was that the Wah was on full by default, every time that I powered up my Stage and Rack the Wah was on by default (cocked wah sound) until I moved the pedal and then it started working like it should but the bad thing was that I don't always have a wah pedal hooked up so I would need to go in and disable the wah to make it stop. I ended up having to do a system reset to get it to stop.
Now a few weeks later I find that the volume pedal is doing kind of the same thing, if I don't have a volume pedal hooked up then the KPA defaults to the minimum volume setting of the volume pedal, in other words, if I don't have a volume pedal plugged in as I scroll through the performance slots they will either be really quiet or no sound at all, so I need to plug a volume pedal in and cycle it to make the KPA work correctly.
I don't have time to troubleshoot your firmware so I will be switching back to my AX8 until you get these bugs sorted out.
Very frustrating to say the least...