There is a convention that allows samples to be loaded on the right Root Key when the name of the sample ends with the root key.
for example "2FilteredFMA 2_c2.wav" would load on key c2.
and "2FilteredFMA 2_c4.wav" would load on c4.
I think that serum uses this functions and also "rapid synthesizer" .
That way users could compare samples while playing a midi file, without the need to set the root key each time.
Thanks
Mehdi
SpaceF-Devices.com