Hi folks.... Been a long time since I've promised to write a post on how to build 64 keys midi keyboard. In fact this post will be on what needs to be done to extend the original post where we built midi keyboard from 32 key piano toy. In this case, of course, you will require a toy with more keys... I have not seen much of the toy pianos with 64 keys (have you?) but I guess you could build a matrix from scratch yourself using push buttons (that is fun!)