I created a test song tonight and changed the voice many times to try out the different voices. I ended up leaving it set to Felicia, saved the project and quit Synth V 2.
Later on I opened Synth V 2 again and loaded my song to play with it more. I again tried to change the voice on the track but no matter what voice I chose it always used Felicia.
To fix this I had to select “Unload the Voice”. Then it would change to whatever voice I selected.