What are the dynamics symbols m, r, s and z ?
The manual says that "n" is Niente (to or from nothing). Usually used with a hairpin.
It says that "r" is Rinforzando and "s" is Sforzando. Are they standard symbols, synonyms for "rfz" and "sfz"?
It says that "m" is Mezzo. What does that mean by itself (as opposed to "mf" or "mp")?
There is no description of "z" in the manual.
Are all these single-letter symbols recognized on playback? Are they familiar to the music community?