Q: i've actually been doing that AP method you were talking about, but the issue is that it seems kind of one-directional. as in, i can think 'D' and hear it in my head, but if i hear a D, i won't automatically make that association backwards and identify it as a D. any pro tips for this
A: you must learn to conjure the memory even while other notes and keys are playing. if you use your voice also that can help guide you part way there