the only keyboard currently being made that will let you record your voice while playing back tracks you have recorded is the Yamaha Motif. It is not an arranger keyboard however. The PSR 9000 will let you record your vocal but not while listening to the tracks you have recorded as a song. You must record your singing as a sample and then sync it to your song. Only the Motif has the ability to sing right along with your song recorded on other tracks.
Kaye's Music Scene
Kaye's Music Scene (Closed after 51 years)
West Hills, California