No, it doesn't specifically say that. It just says that there was such a sound. As far as one can tell, Brian and Danny were the "composers" of this "groove", but they may not have been responsible for all the effects.
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NewguestSo it just says that they came back to the studio and they saw Brian and Danny working on Larry's drum partNo, it doesn't specifically say that. In fact, it doesn't specifically say that Brian and Danny were even present (though it could reasonably be assumed that they were).