Exactly and it's not obvious at first. You can easily see that the system doesn't limit the FP audio in Logic Pro: you can in principle crank up the volume all

Exactly and it's not obvious at first. You can easily see that the system doesn't limit the FP audio in Logic Pro: you can in principle crank up the volume all you want. So if the system volume multiplier is, say, 0.1, you can have a buffer with values -10..10 and that will play at maximum volume fine. Everything beyond that will get clipped by the DAC. So random FP noise clipped is still random FP noise at maximum level.