Designing a large user preferences menu that isn’t confusing

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My app helps pianists to practise their scales. They press a button and are shown a random scale to play. They press the button again and they get another.

I need to allow users to "turn-off" scales, or toggle the boolean variants of those scales, in a preferences screen.

The problem: There are so many scales that my preferences screen is unwieldy. I have 108 unique scales in my app already (with three boolean "variants" each) and that's only 1/3 of what a professional pianist needs to practice regularly.

Background information

A scale is an ascending, then descending pattern of notes starting and finishing on the same key on the keyboard.

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For every one of these 12 keys, there are four different "types" of scale which have major or minor flavours.

  • Octave scale (Major, Harmonic minor, or Melodic minor)
  • Arpeggio (Major or Minor)
  • Scale in sixths (Major or minor)
  • Scale in thirds (Major or minor)

For each of these, a pianist must be able to play the scale:

  • Both hands together OR hands separately
  • Legato (smooth and connected) OR Staccato (percussive and disconnected)
  • Similar motion (hands in same direction) OR Contrary motion (hands in opposite directions)

There's my issue. I can't come up with a way to let a user select from all these options without confusing them. Here are my efforts so far:

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The first design allows the user to toggle variants, but doesn't allow them to turn off scales based on individual keys. The second design allows for the opposite; there is no way to toggle the variants.

Further issues:

  • What if a user wants to turn off all minor scales?
  • What if a user wants to toggle all scales to staccato?
  • What if a user wants to turn off all scales based on A flat, for instance?
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