In the “Style” rule, replace

If, in a sequence of changes, the same state is reached twice, the changes cease having an effect, and no more automatic changes occur until after a manual change.

with

If, in a sequence of changes, the same state is reached twice, the changes cease having an effect, and no more automatic changes occur until after a manual change, or a Musician is added to or removed from the GNDT.

;

If a change of Tempo occurs resulting in three consecutive Musicians playing at the same Tempo, the middle one’s Harmony becomes Consonant. If a change of Tempo occurs resulting in three consecutive Musicians playing at three different Tempos, the middle one’s Harmony becomes Dissonant.

with

If three consecutive Musicians are playing at the same Tempo, the middle one’s Harmony becomes Consonant.  If three consecutive Musicians are playing at three different Tempos, the middle one’s Harmony becomes Dissonant.

; and

If a change in Dynamic occurrs resulting in three consecutive musicians playing the same Dynamic, the middle musician’s tempo is set to Allegro if eir dynamic is Piano, or to Adagio if eir dynamic is Forte.

with

If three consecutive musicians are playing the same Dynamic, the middle musician’s tempo is set to Allegro if eir dynamic is Piano, or to Adagio if eir dynamic is Forte.

.

If it exists, delete the last bullet point of the “Manual Changes of Style” subrule. (See Proposal: Uncluttering)
If it exists, delete the sentence “A Musician going idle, and therefore leaving the GNDT, is a manual change of Style.” from the “Style” rule.