Add a default utterance to each Voicing Node, plus mutator/getter/setter; usages to use this too, see https://github.com/phetsims/scenery/issues/1327
Add a default utterance to each Voicing Node, plus mutator/getter/setter; usages to use this too, see https://github.com/phetsims/scenery/issues/1327

phetsims/scenery,phetsims/scenery,phetsims/scenery