Military Musical Slang

are there any experts out there who can help me with the word drynack it is used in the context of hand copied music manuscript as in "I am busy dryknacking
this marchcard." or "Its a dryknacked part" I have spoken to many musicians about this slang,some feel it may be of a Germanic nature, any ideas anyone.
Please e~mail me
m804@fsmail.net

I've never heard the term and my German isn't, well shall we just say, "isn't".

However music is often written in three-parts, "Drei Noten" literally means "three-notes", and except for a vowel or two, it's pretty close.