Currently TotalMix only allows a 6dB gain increase on its input and output faders.  I sometimes need more than this range for 'riding' the output.  One possibility is to set the input faders for an output mix high, and work the output fader from -6 to +6, for example.

What 'headroom' is designed in the TotalMix mix buss?  Does the mixing process use fixed point processing (0dbfs is the limit) or floating point (not clippable)?  In other words, providing the ADC is not clipping, will gain increases on the input fader result in possible internal clipping or is there enough 'headroom' in the mix path to avoid clipping before the signal is lowered in level by the output fader?