Koch method is to do "full speed" Morse code from the beginning, but only learn 1 or 2 letters at a time.

This Javascript page starts with the letters "k" and "m" for Lesson 1. Then, in Lesson 2, you learn "k, m, and r". Etc. etc.

The way the app works is click on the "k" to hear how "k" sounds. Then click on "m" for its sound. Finally, hit the "Start Lesson" button, and the computer will make a random mix of k and m (and extended pauses, which means "space").

You type in "k m k mm mmkkm" or similar into the textarea, and the computer then sees how accurate you were.

I haven't learned the full alphabet yet. I'm still missing letters q, g, h, z, x,c, v and all the digits.

Something I've found interesting is how much difference it made changing the tone frequency. My brain definitely got used to a certain tone initially, and when I first tried changing the tone my recognition ability dropped quite a bit. So now I change it occasionally to keep my brain on its proverbial toes.

I wish there was a way to practice just the letters I have more difficulty with; namely, the ones which were added later.

I thought it would be a fun thing to have on a phone.

Really nice to be able to shut it up with wet hands.