The first four FX are loopers…
- loop 16
- loop 12
- loop short
- loop shorter
FX can be recorded, so there may be some possibilities there.
Sound creation wise, here’s what the super handy online manual has to say…
PO-33 has 16 sounds divided into two sections; melodic and drum. a recorded sound will behave differently depending on which section it was recorded to.
in the melodic section the keys from 1-16 represents a scale, and each key will trigger the whole sound.
in the drum section each key from 1-16 represents a slice of the sound.