The secret of the tuba bass accordion... Specially designed and crafted "petosa" reeds. Because of their large size and unique design, these reeds provide the deep, resilient "Tuba" sound that makes the tuba bass model possible.

(A normal bass reed and a "petosa" Tuba Bass reed side by side. Note the large size of the Tuba Bass reed...)

(Scale: 1" = approx. 2.25")