Adam Rapa started asking us about a four valve insturment last year. He was looking for an instrument with an extended low register and a new sound that offered more power and a wider variety of colors than even his regular, custom PRANA 3 Bb. Since many players have asked us over the years to build various four valve instruments, we decided to take the plunge into four valve reality and see what we could come up with. The big challenge with this instrument was getting the re