could be trigs, lfos or external midi.
check if there are trigs in the gridmode. trigs can be trigless but not hidden. fight your fears! if you want to clear them, press func+clear(the play button). make sure to be in grid mode, otherwise you will clear the whole sequence.
clear lfos by pressing lfo+clear
unplug midi loopback cable, yo!
sample should play fine now.
some bonus goodies:
func+trig to change from and to chromatic playmode.
func+yes to save current pattern, tweak any sample parameter while holding TRK to change parameter for every track, func+no to reload your pattern.
enjoy!