Here is my theory about dopamine:
Sulpiride is an dopamine angonist. It lowers your level of dopamine.
https://www.ncbi.nlm.nih.gov/pubmed/17942035
Pramipexole is a dopamine agonist. It raises your dopamine level.
https://www.ncbi.nlm.nih.gov/pubmed/?term=pramipexole+tinnitus
Aripiprazole is...