6:3, 4:2, 2:1

[Mark Montbriand]

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I see alot of information regarding tuning octives:
6:3 in the bass
4:2 in the middle
2:1 in the treble

Would someone mind telling me what these "ratios" mean?
what is 6:3, 4:2, and 2:1

Thank you very much

Mark
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