Hi Jonathan,
We’ve been in touch through Email. Thanks for pointing out that slight mistake on Basic Theory course, lesson 3. I’m fixing it now!
I hope you saw my email saying that the Organ Course 1 dives very very deeply into playing the BUBBLE. There’s a little about it on Piano Course 2 but you generally do not play the bubble on the piano. Check that organ course and let me know what you think!
Matt