Print "pizz." only once until "ord."

Hello All, "pizz." is usually marked above a score only once. Performers presume all subsequent music is pizzicato until "ord." appears. I'm looking to write scheme functions \pizz and \ord with this behavior. \pizz should only print the first time it is called and then do nothing until after

\repeat unfold 0 times?

Hello All, I have a little scheme function which gives me the number of times to repeat a particular bit of music in my composition. Sometimes I want that number to be zero and thus print no music at all. I'm using the "\repeat unfold repeatcount" syntax. However, when repeatcount is zero,

Autochange with Staves named other than "up" and "down"

Hello Community, I'm writing a piano piece across three staves. Sometimes I would like to use autochange to engrave material on the top two staves, other times across the bottom two. I know autochange works by default on staves named "up" and "down". Is there any way to override the names of