The invert option is in the 2448 software....with mine, I usually have to change it from whatever it was when I powered on the input source. Ie: If it was set to invert then I powered on my R300, I would have to change it to normal (non-inverted, can't remember off hand what the non-inverted setting is called).....or it it was set to standard, power on the R300, have to change it to invert. If I don't make the change, the signal is hosed (totally non-listenable), definately no way you could not hear it.