They were heard on the video just like i hear the tyros sounds on the video and the casio sounds and the kronos sounds and the motif sounds. Where did you hear these sounds ?
Then how can you give your opinion on the sounds. These videos sucks and are of very low quality. You can't judge an keyboard on these videos. The quality of the videos of the Tyros 4 are much better. You can give your opinion at the moment the videos of the PA3X have the same quality as these of Yamaha. About 2 a 3 months I think.