I was intrigued when my son had paradoxical reactions to GABA analogues so dug more into this (also has paradoxical reactions to benadryl, which is a different can of worms).
I think ASD, ADHD etc are all linked in terms of neurotransmitters and ion channel imbalance that causes overload on various pathways.
On interesting element on auditory processing is the similarities between ASD auditory sensitivity and hypokalemic sensory overload. Anecdotally I have seen dosing potassium reducing auditory sensitivity short term for possibly this reason.