The VMF-2 is a 2 channel mixer/fader. It will fade from A to B, B to A or A to Black. There is an auto mode that allows the transition to be preset from 0.2 seconds (approx. 6 Frames) to 6 seconds. The transition occurs upon hitting the TAKE button or a GPI trigger. In the A to B mode, the sources must be genlocked. In the A to Black mode, no B input is required. The output is dc clamped to zero Volts. The VMF-2 is 12 Vdc powered, wall module included.