[dm2]

Looks awesome, great idea!

I have one feature suggestion, could you make a demo mode or way to preview the sounds. I do not have an ear for notes and have no way to learn the sounds. The functionality might already be built in, I couldn't figure out where it was though.

[mgallivan]

I don't quite understand what you mean by preview the sounds? Do you mean like previewing the intervals? I can add small buttons next to each to give you a glimpse - thanks for the suggestion!

I was mostly going off the assumption that people would select one or two intervals at a time, learn them through error, and then select a few more but this is an easy change for more clarification.