Susato Press Edition: SUP56 Capped Reeds Companion, by George Kelischek is an Instruction book for all sizes of Capped Reed Instruments such as Crumhorns, Cornamusen, Kelhorns and nine-note instruments like Octagons or Gemshorns.  It also contains 16 multi-part arrangements for various nine-note instruments. (See also our "Nine is Fine"  series of Susato Press Editions)