What did you find when you studied how people actually used it?
The first thing was the context. People weren't using this alone in quiet rooms, where hearing aids generally work fine anyway. They were using it in exactly the hardest situations — family dinners, restaurants, group conversations at work.
Crowded, unpredictable, acoustically messy environments where several people talk at once.The second thing was more important, and it reframed everything. Users were embarrassed. Hearing loss is a disability people actively hide. They've spent years developing invisible workarounds — positioning themselves to read lips, choosing the seat that puts their good ear toward the table, asking people to repeat things while pretending they were just distracted. The struggle is real, but the performance of not-struggling is just as real.
So the actual problem was never "this person can't hear well in a noisy room." The real problem was "this person can't hear well in a noisy room and does not want anyone at the table to know it." If I'd only designed for the first version, I'd have built something technically correct and socially unusable.
That's the moment the project changed subject for me. It stopped being an audio-controls problem and became a problem about dignity — about how to give someone power over their hearing without forcing them to announce, in front of other people, that they need it.