<https://www.accordionists.info/threads/a-definition-of-tuning.7173/>
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"I bought a LMM piano accordion recently, the tuning of which was defined by the seller in the following way.\n\nthe tuning appears to be A=442 + 20C for about 5HZ vibrato in middle of keyboard, which is typical of Italian tuning\n\nPlease could..."
<https://www.accordionists.info/threads/a-definition-of-tuning.7173/#post-75908>