Professor Johan Liljencrants was a member of the restoration team from the beginning. He was a brilliant mathematician and at the same time no stranger to various tools. He designed and built a complete street organ entirely from scratch. He also was one of the few who understood how a Wurlitzer tremulant really works. Here are some links: www.fonema.se the Professor's home page
A tremulant discussion: http://fonema.se/tremsim/tremsim.html

We did a lot of measurements, here on valve reaction times. http://fonema.se/valvetime/valvetime.html

Wurlitzer reservoirs: http://fonema.se/wreg/wreg.html

The Professor’s organ, design and build: http://fonema.se/organ/organ.htm