Modifying default values for articulation shorthand notation

The shorthands are defined in ly/script-init.ly, where the variables dashHat, dashPlus, dashDash, dashBang, dashLarger, dashDot, and dashUnderscore are assigned default values. The default values for the shorthands can be modified. For example, to associate the -+ (dashPlus) shorthand with the trill symbol instead of the default + symbol, assign the value \trill to the variable dashPlus:

\version "2.24.0"

\paper { tagline = ##f }

\relative c'' { c1-+ }

dashPlus = \trill

\relative c'' { c1-+ }