Walk-Up Bass Technique from I to IV: https://accordionlove.com/course/chromatic-walkdown-technique/
Half-Step Bass Jump: https://accordionlove.com/course/half-step-bass-jumps/
Slash Chords: https://accordionlove.com/course/playing-slash-chords/
Chromatic Walk-Down: https://accordionlove.com/course/chromatic-walkdown-technique/
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Squeeze and Thanks Accordion Charts: https://www.squeezeandthanks.com/learning