Smart phones make lousy hearing aids. First the microphone needs to be in your ear for directionality, not on the phone. Second, phones don't have realtime oper

Smart phones make lousy hearing aids. First the microphone needs to be in your ear for directionality, not on the phone. Second, phones don't have realtime operating systems, so latency and dropouts can be a problem unless you program them very carefully. And even then it's not 100% predictable what's going to screw up the signal path.