I recently purchased a Filco keypad - my first foray into cherries of any kind. I have noticed that a few of the keys, if struck hard enough, produce a high pitched ping / ringing sound (definitely metallic in nature).
I don't think that the pinging noise is produced with standard force key presses, but if I really hit a key I can hear it.
That said, is this a regular sound associated with brown cherries in general, or something associated with Filco boards? Just curious as I am close to purchasing the matching 10-keyless Filco board (as the Keypad is so nice)...