I completely agree. Shimmer should not be the only way. I have created my GPT as a ChatGPT Plus subscriber and I realise that Open AI have https://platform.openai.com/docs/guides/text-to-speech options for male voices such as Onyx. I think having a choice of voice is very important and I am looking forward to the fix so that the GPTs use whatever voice the user has set in their personal settings or a custom voice per GPT that fits with the persona of the GPT.