I have come across an unusual roll.  On the label says

  "Rythmodik record music roll, especially prepared for Solo-elle"

What sort of player is this for and how common is it?  It has expression
holes on either side: 7 on the right hand side (two of these hit playing
notes 87 and 88) and at least 3 on the left.  The notes are normal 9-to-
the-inch, and it works fine on a normal player.  Thanks for any info.

Peter Coggins