The B11 Sansula is the same as the standard B9 Sansula, but a little different. The physics of sound explain it:
The B11 Sansula is built on a sansula body – that amazing and lovely wood-framed echo chamber that makes the great wah-wah sounds – but notes on the B11 go lower than the B9’s, so, to achieve proper resonance, the B11’s sansula body is about 10% larger than the standard Sansula’s.
You have a variety of possibilities for the tuning of a B11 Sansula – starting with the standard G Major, (the Melody tuning). Or choose from the others I’ve introduced in recent months: The Wizard tuning, The Four Winds tuning (four distinct uses of one tuning!), and this month, Dajari-F. Instructional downloads are available for all of these B11 tunings except for Dajari-F, which should be out in about a month. Learn more about the B11 tunings.
I should note: there are several types of sansula body, and the B11 Sansula is of the “standard sansula” style, meaning the thin membrane covering the resonant frame is made of something like rice paper. If you drop a B11, that membrane will break.