Fran ..... the newer Korgs have no down time with either format of smf. Also, you SHOULD have all your homework done BEFORE you load the hard drive. (or puny zip in the G1000's case)
Stage is NO PLACE to be playing files of different types .....all that needs to be worked out at home. You should just hit go and be on your way ! That way .... you can devote the last few active brain cells to playing ! (Lazy, whitebearded, checkcashing, old man !)