For my home setup, I wanted to make my voice assistant sound like Jarvis from Iron man. However the included TTS services in Rhasspy did not satisfy me completely so I looked for a voice that sounded closer to the Jarvis I wanted.
One of the few free TTS services I found that met my needs was IBM’s cloud TTS. The free tier is more than enough for home use and the voices sounds awesome.
You can hear the different voices here, for Jarvis I used the male britsh voice (James)
I adapted a shell script to query IBM’s API when needed and cache the audio files.
Installation and usage instructions can be found on my github repo Rayz224/rhasspy-IBMWatson for anyone interested