Hello!  As the Triola is currently being discussed, I have a question
or two:

1. Does anyone supply new rolls for the Triola?

2. Does anyone have advice on punching new rolls?

Background: I write and update the software for a punching machine
(of Rudolf Klomfar at www.notenlochband.de), which works with a single
punch moved by a belt over the paper.  The process is slow but is
_very_ flexible, except that we cannot, at this moment, do different
diameters of holes.  However, the Triola rolls have two special aspects:

(a) The bass chords are _printed_ on the paper.

(b) Besides the larger 5 mm [0.196"] holes (or rather, slots), there
are small 3 mm [0.118"] holes on one side which just indicate to the
player when to play the bass chords (if I understood them correctly).

Regarding (a), we toyed with the ideas of

 - adding a "print punch", which would stamp a text on the paper --
much too complicated; or

 - punching the bass chord as a "code pattern" (like a Braille pattern)
but first, the player would have to decipher the "code", and second,
there is actually not enough space for this ...

So we will stamp the text on the paper manually, probably using a file
created by the punching program which says, in meters from the start of
the roll, where to stamp what (so that we do not have to "re-engineer"
the music from the roll to find the spots for the bass chords).

Regarding (b), we want to use a 3 mm punch and punch the actual wide
slots by overlapped punching, but our first experiments created quite
torn holes.

Any ideas or experiences that might help us?

Regards

Harald M. Mueller
Grafing b. Muenchen - Germany
http://www.haraldmmueller.de/