Mad_Cyril …pretty much all of that!
@gcw better quality circuitry & less crap in the signal path- low-distortion, shitloads of headroom. As Cyril says, all of which means much more capable summing, ie.when you have 2 (or more) channels up, its has much better capacity to ‘sum’ them into a single, stereo output without redlining and generally sounding shitty when played loud.
Plus, mixing with the HPF is lush… you won’t want to go back to EQ’s once you get used to it.