Do any of you run backing tracks/other instruments ( keys, etc ) through the FRFR cab you use with your AxeFX and if so, does it negatively affect the quality of the AxeFX's sound? In other words, does the AxeFX get swallowed up or muddied up? Also, how hard is it to hit the DSP limit for the FX section? Trying to gather some input from experienced users for a friend with his finger on the AxeFX trigger. Thanks guys!