If the Play button does the same as the Generate button (Play Generates if required), then we wouldn't need two buttons. I agree that it's OK to have two buttons, but the individual behavior should be consistent between the two. Re-Generation shouldn't occur if the Play is selected.

However, if it is (unexpectedly) going to occur, give the user an option to back-out and freeze tracks first. Would save a lot of frustration.

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