In the realband manual page 72 there is a reference to rests, etc.

Rests/Shot/Held Chord/Pushes
Rests, Shot, Held Chord, and Pushes are supported by the RealBand generation routines:
A chord can be specified as a Rest by adding a period after the chord.
e.g. “C.” indicates a C chord that is a Rest.
A chord can be specified as a Shot by adding two periods after the chord.
e.g. “C..” indicates a C chord that is a Shot.
A chord can be specified as a Held Chord by adding three periods after the chord.
e.g. “C…” indicates a C chord that is a Held Chord.
Pushes:
^C = 8th push
^^C = 16th push
Note: Pushes, Shots, Rests, Hold Chords can ONLY be entered in the Chords Window.
Part Markers


Chris