OK, we don't know all the details of how it works...Craig has developed it, nevertheless.
My God his voice sounds super....so go to the youtube video, signup and vote to have it...whether you have a T4 or not. That is what he is looking for..SUPPORT for this so Yamaha WILL approve it for T4 and ??

I don't know the details...all he told me last night was he developed the software to do this, IT IS NOT ON THE T4 today.
If you want it...go support him.

Meanwhile, I will conytact him and see IF he will tell me how it works.
IF this becomes available I will buy a T4, 100% for sure. I would have a ball with this.