Yesterday in the morning I downloaded free trial of Hauptwerk 5 with the help of which I improvised St Anne's Vision at the church using my MIDI keyboard. When I came to our Unda Maris rehearsal, I showed the students how Hauptwerk works and they played a little too.
Yesterday I also unpacked Paper Organ package which I received recently from Germany. It looks complex. Will need to read the instructions carefully on how to put together some paper organ pipes, keys and a sturdy rubber balloon. If completed successfully, it would serve perfectly for educational purposes.