All below are snippets of the album “Stiff Wind” produced by Trouble in the Glen back in the mid-2000’s.

Kron Standard, low A ~ 478 Hz -> This Kron standard is equivalent to an Atherton Glen. Rocket drone reeds were probably used.

Soutar, low A ~ 473 Hz -> No idea on the drone reeds.

Henderson, low A ~ 472 Hz -> Probably Shepherd SM-90 drone reeds.