"Gamma files" for Use With MIDIBoek and Noteur Software
I have identified a problem with downloading Gamma (.GAM)
files. It is NOT a problem with the files I have created, but
with the ways Internet Explorer (IE) and Firefox
download text files. If you open a text (.TXT)
file in IE and then use "Save As" IE inserts header material
which results in a non-functional .GAM file. If you open
a text (.TXT) file in FireFox and then use "Save As" Firefox
changes the "Enter" characters to a value which results in a
non-functional .GAM file.
The safest way to save .TXT and .GAM files in their
original form with a Windows browser is to Right-Click
on the file name and use Save As
when the choice is offered.
Gamma files may be viewed and edited in the Windows
utility program Notepad.
If you are working with .GAM and .TXT files, Windows Explorer
should be set to display files extensions in your directories.
The files below are provided as .GAM files. For use in
MIDIBoek and Noteur they must be placed in the midigam directory
on Drive C. The MIDIBoek and Noteur programs
work only in the Windows operating system.
Files for the 20 note Carl Frei Scale:
It is important to understand that there are a variety of
implementations of the Carl Frei 20 note scale. At its heart, the
Frei 20er scale is simply a set of note intervals above a starting
John Smith Busker organs and most Raffin organs use an F (MIDI No.
53) as the starting point in tuning.
It is not clear to me what Frei's original choice was, but I have
chosen the actual notes played as my personal arranging scale.
With this choice, most tunes are played in B flat (Bb), with a few
A good many smaller organs are tuned starting with MIDI 54 G. From
the organ building standpoint this has the advantage of shortening
all of the pipes by about 11%. It also results in a primary key of
C when playing. Some arrangers chose to work in this scale since
they consider C easier to work in than Bb. In particular, Mel
Wright and Alan Pell have chosen this implementation.
Other small organs may be tuned even higher. There is a "Raffin
20" file on the MIDIBoek site which starts about 10 semi-tones
higher, and there are certainly others on the INTERNET. These
files are not "wrong," they just don't match my arranging scale.
They can be used with my arrangement .MID files if a proper
translation value is selected. Similarly, you can use other
arranger's .MID files with my .GAM files if you find the proper
Regardless of the starting note chosen in arranging, a "standard"
20er paper roll will play on organs with many different tunings.
The files below are set up using my personal choice - starting
with MIDI No. 53 F. They match the 20 note arrangements found on
my web pages.
- John Smith 20 note rolls -
These are the "big hole" 20 note rolls used on the John Smith
Busker and John Smith Senior 20 organs.
- Annotated "Raffin 20"
file - includes a bunch of comments - for most modern
keyless 20er organs, regardless of tuning.
- Öhrlein 20 or Oherlein 20
- These are keyless book playing organs made by Franz
Öhrlein, Mainz, Germany. Book pages are 10 cm wide by 14
Files for editing 26 and 31 note MIDI Files:
I created these files to help me visualize the various voices -
bass, accompaniment, melody, and what I think of as the high
ornamentation lines - while editing MIDI files for the
Alderman/Wright/Jager&Brommer 26 and Raffin 31 note organs.
The voices as shown as bars in different colors. They are best
viewed with the "filled notes" option selected. They were created
for use in analysis, not punching.
Files for Wurlitzer band organ scales:
At this time, the Gamma files below are intended for checking
MIDI files, not for printing. I have been trying to find someone
punching one-off Wurlitzer rolls from MIDI files, but currently no
one seems to be providing such service. The first two Gamma files
are constructed to match the note assignments in the large
collection of MIDI files on Terry Smythe's collection
of 153 Wurlitzer 150 band organ tunes and 30 Wurlitzer 125 band
organ tunes on his site at
The 165 Gamma includes some information on Stinson extensions to
the Wurlitzer scan. These differences are annotated.
Files for other scales: