Thanks for that.
Turns out you just need to play the original version (Miku's version) on Normal difficulty twice to unlock Len's version and a third time to unlock Rin's version.
Whee 100% song unlocks. Now to work on Perfect clearing Normal (20 songs to go~) and Hard (a long way to go :P).
And from there, I'll surely unlock 100% on Module Convert and Miku's Room.
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