Hello Tomo,
For the 4th string chromatic exercise, are you lifting your thumb off the back of the neck and then putting it back on as you are ascending and descending the frets or is your thumb sliding along the neck?
Thanks,
Dozy
Here is Tomo's reply:
"Thanks so much for subscribing to my Guitar Wisdom. About moving your thumb when you change position . . . you can learn that by watching this video lesson again. Don’t try to learn it by words. Always use less pressure, and make sure you check your thumb position for less pressure."