Lips
Rounded from the start and staying lightly rounded through the r. The diagram shows the rounded starting shape.
The American "or": start on a rounded "or" vowel, then glide into the r colour. Keep it one flowing sound.
Example words: north, more, four, door, morning

Rounded from the start and staying lightly rounded through the r. The diagram shows the rounded starting shape.
Start low-mid and back, as for a rounded "aw". Then curl the tip up and back, or bunch the mid-tongue, into the r. The tip never touches the roof of the mouth.
Long. Let the rounded start ring before the r colour arrives.
Say "four" and hold the ending for a second. You should hear a steady r colour with your lips still lightly rounded. If the word fades out with no r, or you feel the tongue tap, reset and try again.
Dropping the r so "more" becomes "maw", or tapping and trilling the tongue. The r is a held shape, not a hit.
🔊 plays the app's native voice. 🎤 records you so you can play it back next to it. Your recording stays in your browser.