How embarrassing for them!
Apparently the word "interface" is ambiguous.
We're talking about the AES and SPDIF digital interfaces, not the USB computer audio interface.
Yes, a non-professional keyboard. I hope the Montage does better.
It may well be, but that's irrelevant.
In a digital studio, the master clock determines the frequency and phase.
It's like an orchestra -- the players follow the conductor.
A sample rate converter chip is like $3.
The Axe and cabinet IRs can run internally at 48khz.
Only the AES and SPDIF interfaces need to be flexible.
In a digital studio, every single device is a slave.
Slaves place no requirements on the clock.