When using TM FX to mix a variety of channels to an output, if the output channel volume is reduce to prevent clipping the output, what "headroom" is available internally to ensure that the sum of those channels (before output volume reduction) does not clip internally as well - I want to make sure I'm not just reducing the volume of an already clipped signal with no way to observe that the signal is actually clipped!

I've got a UFX, if the digital "headroom" is model dependent.