Compared to other interfaces i owned, the studio's 68 frequency response seems extremly limited at higher frequencies (see loop-measurement attached, the green line is a loop measurement out1 to in 1 @ 192 KHz. Instrument, line, symetrical or asymetrical makes no difference)
As even cheap consumer soundcards and on-mainboard chips (Realtec HD Audio) are able to show a pretty linear response up to samplingrate/2, this should be not a big deal. A cut at above 30 KHz at 192 KHz sampling frequency is inacceptable and still worse then at 96 KHz. The customer support thinks it's not a defect of the hardware and proposes opening a feature request here.
Maybe it's not important für recording and pure audio purpose, but sometimes, interfaces get used for measurements of components (loudspeakers, Pickups....) where this point becomes important.
orange: @ 48 KHz: OK
blue: @ 96 KHz: Drops far to early
green: @ 192 KHz: a joke?