Background, in Swedish, is available at http://www.npsalmodikonforbundet.se on the club's website (click on the button that says Kontaka oss [contact us] for a pulldown directory and on Öpna [open] to open an item in the directory). Even if you don't read Swedish, you can find some cool pictures by scrolling down to Bilder [pictures] and clicking on the Öpna button.
A mostly Norwegian-American group in Minnesota, called the Nordic Psalmodikonforbundet (no umlaut in Norwegian), has a wealth of information in English at http://www.psalmodikon.com.
Here's what I wrote, translated into Swedish and (since I can't find my original draft anymore) translated back into English:
On 2 August, I led a workshop on the psalmodikon for the Bishop Hill Heritage Association in the old Swedish colony of Bishop Hill in Illinois. There were 21 persons. When I in the beginning of my appearance asked if they knew of the instrument Psalmodikon it was only two or three people who raised their hands.
I have a copy of an instrument made in Bishop Hill in 1870 and I showed how to play on it and got them to sing " A Mighty Fortress is our God" by numerical scores [the siffernoter] so they would understand how the numbers relate to the notes in the scale. It was great fun and I think the audience appreciated it.
MORE ON THE PSALMODIKON: In April 2015 I will be presenting a workshop, "Pastor Esbjörn's Singing School," at the Augustana Founder's Day Renuion in Andover:
On Saturday, April 25, there will be interest groups during the day, with a noon lunch and an evening smorgasbord. The evening will close with a hymn sing and brief Vesper service.
On Sunday, April 26, there will be a morning worship service, followed by a noon lunch. The Augustana College Choir will give a special concert from 2:30 - 3:30 pm. ELCA Presiding Bishop Elizabeth A. Eaton will be the preacher at the 4:00 pm Founders Day Service. The Reunion will end with an evening dinner.
This special event celebrates the 155th anniversary of the Augustana Synod and the 165th anniversary of the Andover congregation. …
My workshop will be one of the breakout sessions for interest groups on Saturday. The Rev. Lars Paul Esbjörn was the first pastor at Andover's Jenny Lind Chapel/Augustana Lutheran Church and one of the founders of the old Augustana Evangelical Lutheran Synod, and I have been learning tunes from a handwritten booklet of his siffernoter tablature in the Special Collections at Augustana College's Tredway Library.