The WX11 is a MIDI wind-controler made by Yamaha some years ago. It has 14 keys (Boehm).
As a sax player, i was a little bit disturbed by the lack of high keys. I decided to add 2 keys.

If you own a WX11, don't do that !, at least for 2 reasons:
1- You can damage your WX11. (You would be the only one responsable)
2- The musician has to adapt himself to his instrument, not the opposite !

The idea is to connect new keys to existing keys (sorry, i don't have the references of the switches anymore)
The numbers show where to connect the pins of the switches.

The pins have to be flatten; the internal partitions of the WX11 are cut for the installation of the switches.

Cables are maintened by little plastic pieces (CD cover).

The keys are made with plastic strips (CD cover too) and rubber pads for chair.

Pay attention to the length of wires: if they are too long, you won't be able to close the WX11 body.

Here's the result. Not so bad with such materials ?