One inbox, read by a human:
Bug reports: say which tool, which device and browser, and what you expected versus what happened. If the detector misread a note, the note you played and the Hz it showed are the two numbers that let us reproduce it.
Accuracy doubts: before writing, open the device report inside the tool — if noise suppression shows ON, that's usually the culprit, and the report text explains why.
Feature ideas: always welcome. Small, sharp tools stay small and sharp, so not everything gets built — but everything gets read.
We can't see your data, because we never receive any — audio stays on your device (see privacy). So "can you recover my recording" is sadly a no; there's nothing on our side to recover.