Home / Forums / General melodica discussion / P-37D wildly out of tune? Also: delayed key sound. / Reply To: P-37D wildly out of tune? Also: delayed key sound. Reply To: P-37D wildly out of tune? Also: delayed key sound. January 26, 2022 at 8:41 pm #13989 Alan BrintonParticipant Absolutely. The same with scraping, a little bit at a time, and less is required on higher (increasingly smaller) reeds.