Triple Video Fader & Key Generator

Role in a patch

The Triple Video Fader & Key Generator (TVFKG) gives you three independent voltage-controlled crossfaders, each with its own key generator (voltage comparator). You can crossfade, perform analog multiplication–style routings, build luma and chroma keys, window comparisons, and amplitude classification from the same 16 HP without chaining half a row of small utilities.

Cascaded input columns and selectable crossfader control source modes (fade from CV, key, or logical AND of all three keys) are what make complex layered patches tractable. Crossfaders 2 and 3 can optionally follow crossfader 1 as a master bus—handy for broadcast-style A/B and hold transitions under one shared control.

Crossfader (per channel)

A voltage-controlled crossfader has two inputs and one output. At 0 V on the control bus, A is fully on; at 1 V, B is fully on. Between those rails you get a proportional mix. If you feed B only, the fader acts like a VCA for that channel.

Key generator (per channel)

Each key is a high-speed comparator: when the key input (after conditioning) is above the sum of the CV and bias, the key output is 1 V; otherwise 0 V. Inversion switches let you work with the complement for matte edges and hard wipes.

CV and bias inputs include level and inversion; their sum sets the key threshold, and in fade mode that same sum can drive the fader position directly. In key mode, the key output opens and closes the fader. In and mode, a logical AND of all three key outputs drives the fader (useful for “all conditions true” gating).

On the product hub

Open the Specs tab for the full connector list, current draw, and LZXdb feature line items. The Support tab links troubleshooting and the forum archive. For legacy Visionary build notes, search the community forum for “TVFKG” and “Triple Video Fader”.

Power and size (summary)

16 HP · +12V @ 135 mA (reference from the module database; confirm on Specs for your revision).

Community

Search the LZX community forum for patch threads and repair notes on Visionary series modules.