I like the format you use on Box Lesson. What is important to me is played at speed, broken down into phrases and played slowly showing the right hand and bellows (for direction). Both the A and B part as a lesson. Lyrics done phonetically would be nice.
Leslie

I use Media Player Classic.
With that player I can slow down a video.
The speed will become the half of the origin speed.
The music will sound one octave lower.
One click on the rewind sign is enough.
In the early days (1970-1990) I use a two speed tape recorder to do the same.
See the second link.
It helps me some times.
You can see the flappers of the Cajun accordion go up and down and you can see some details.

Nick,

I believe your website is close to perfect.
My learning process is.
-Get the tune in my head, vocals help a lot.
-Learn phrase by phrase.
-Play slow but accurate.
-Play at speed.
-Play simple.
-Add bells and whistle to melody.

Again, a big thanks for passing on our knowledge.

RPr