I've just ordered 30 Miyama DS-412 switches. I have also modified the great keybed and piston rail to accept appropriately positioned pistons.

The X-Keys stick has performed well, but is ultimately unsuitable for the task; it is too deep and the buttons are too sensitive.

 

I'm getting quite good at modifying the keys! 

I posted this information on the Hauptwerk forum, but wanted to put all of the organ info in one place.


I have connected a Yamaha FC-7 expression pedal to the swell keyboard MIDI controller volume connector. I did not want to cut the FC-7 cable so I bought a 6.35mm Stereo Long Reach Chassis Socket from Maplin http://www.maplin.co.uk/Module.aspx?ModuleNo=223988 .
I connected the socket as follows.


Socket : Keystation volume control wires
Tip ----> red crosses
Ring ----> white
Sleeve ----> red dashes


I was very surprised that it worked first time!