Fx is an Instrumii that you get in Chapter 2 in Paper Mario Instrumental.
FX looks like a musical note withe eyes.
He uses musical notes to retrieve and press stuff over long gaps.
HP(when first met):15
-Sing-a-round(FP:2)(Damage:2)(Damages everyone on the field)
-Screechy Keen(FP:4)(Damage:4)(Paralyzes enemy)
-Battle Cry(FP:4)(Damage:4)(Damages everyone on the field)