I just installed FW18 on my Axe-Fx II, which I also use as main soundcard on my computer. I usually have the output 1 level at around 9:00. There is no volume difference when monitoring, but playback a recording or any audio file is dead silent, I have to set the output level knob to at least 13:00 to be able to hear anything at all, and even then it's whisper quiet. Any ideas?