See sibling for testing methodology. It seems good at face value to me, however I did stumble a bit when doing the full alphabet out loud test with it (joy air,

See sibling for testing methodology. It seems good at face value to me, however I did stumble a bit when doing the full alphabet out loud test with it (joy air, joy bat, joy crunch, etc...). I think there’s a harder to quantify component that causes the stumbles/tongue twisting, that is where your mouth/tongue position ends up when you finish speaking the letter.