[aristoxenus]

Nah, not useless -- come on. The speed variations aren't going to be that huge, and the variations will matter even less on an iPad. I can imagine a number of technical solutions to this issue that don't involve any signal processing. It's a valid point insofar as it would need to be addressed for advanced players, but let's not be so quick to dismiss this guy: the app is absolutely beautiful and he's clearly skilled and thoughtful.

[cj]

I wasn't dismissing it. For 90% of people who would consider this app, it's great! I really just posted this because someone previously said that this could replace sheet music.

The highlighting of the keys is also an amazing feature. I've posted YouTube videos of me playing the piano with the camera angled unintentionally over my shoulder.. and actually used the video to see what keys I was playing and copied what I was doing.

There should definitely be a "no sheetmusic" mode in this app for people who previously copied people's finger position on youtube... for people who have no desire to learn how to read sheet music.

Good luck.

[latortuga]

He's not dismissing it, he's giving feedback. This is exactly the kind of thing I'd want to hear if I were launching - how I can make my product better and appeal to more people.