You need a software synthesizer to be running to get audio in RehearScore. Install Timidity (or Fluidsynth) via package manager and start it in a separate terminal, e.g. timidity -iA
You need a software synthesizer to be running to get audio in RehearScore. Install Timidity (or Fluidsynth) via package manager and start it in a separate terminal, e.g. timidity -iA