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Thanks for your comments...
Today I went through my Naniwa progression.
Almost no sound, especially at 8k and 12k...

Must be the shapton glass stones.

Anyway, I will try to find out more...

Hi folks,

When honing I try to hear all possible changes from stone to stone and of course during the laps on 1 stone.
Besides the feeling that changes when you reach the apex, the sound changes...