i am sorry sunny that the T4 doesnt have the same instruments you liked in the Lower model. Is there any other top of the range arranger that has them ? why not write to yamaha directly. They may respond to your query and give you a straight yes or no answer if they will be providing premium packs for the instruments you want. At least then you would know one way or the other. If enough people did this then maybe yamaha might see that there is an opportunity here.