As a musician, to become a master in all 12 keys, you need to practice your fluency.
This app will help you work on your scales and modes.
There is also a fun timed challenge.
https://andro.io/app/x12keys
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Android app profile
12 keys for Android – Latest Version & Features
by 441 Lab
★★★★★
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> 2.2k
Monthly Downloads
~$900
Estimated Cost
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