there are no hidden kits. they are just edited. you can edit each drum kit key by sysex commands. you will need external editor for this, you can't do this on PSR itself. But in styles, you can inster sysex commands to edit any drum key, refer to the MIDI documentation.
In that hip hop style, the snare is pitched up..
I do this all the time on my SW1000XG sound card using the XGEdit software.
[This message has been edited by Shakil (edited 02-19-2004).]