@Nathan Carns Yes, you are correct, to develop a model for speech to text we need a deep learning model here. This is out of the scope of Azure Machine Learning Studio(classic). But I think Azure Machine Learning service should support it, please refer to this: https://learn.microsoft.com/en-us/azure/machine-learning/concept-deep-learning-vs-machine-learning#machine-translation
I have found one post which may help: https://towardsdatascience.com/audio-deep-learning-made-simple-automatic-speech-recognition-asr-how-it-works-716cfce4c706
Moreover, I have forwarded your feedback to see any plan here for Nigerian in Azure.
Thanks.
Yutong