Yamaha PSR-SX900 VS Yamaha PSR-S975 Sounds Comparison

Justin Takes a look at the Yamaha PSR-SX900 and the Previous model the PSR-S975. we take you through some of the various features on the sx900 that simply don't exist on the s975 as well as a sound comparison between the two on various different sounds.
Which one do you think is the best? Let us know down in the comments.