Korg KF4 manual Using the Luma Key Function, Combining Features and Functions, Stutter Effect

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Using the Luma Key Function

The Luma key function allows the krossfour to ignore black, white, or grays in a video source, and allows the second channel to pass through in the black, white or gray areas…

1.Select two different input sources for channels 1 and 2 - make sure that channel 2 source has black, white or gray in it.

2.Move the cross-fader to the far-right position.

3.Move the mode switch located on the front panel, to position 4, labeled L-K.

4.Using the fine-tune knob located on the front panel, eliminate or key out black, white, or grays from the channel two source. You will see the image from channel 1 passing through, but only where black, white, or grays used to be.

Combining Features and Functions

The krossfour contains many unique features and functions. The real magic for a visual performance begins when these features and functions are combined. Here are some examples:

1.Stutter Effect

a.Assign same video source to both channels

b.Put cross-fade curve to 4th position

c.Set the mode switch to Black (B).

d.Apply HOLD to channel B

e.Move cross-fader back and forth over the cut off point creating a stutter effect.

f.Release HOLD and repeat process (steps d-g) as video advances.

g.Experiment using different fader curves.

2.Background Effects using the Luma Key

a.Select an empty input on channel A resulting in a blue background

b.Select video source on channel B

c.Set mode to Luma-Key (L-K)

d.Move Fader all the way to channel B

e.Rotate fine tune knob to key out light and dark info on channel B

f.Blue background on channel A is revealed

Variation 1 on this effect:

a.Select empty input on channel A

b.Set the mode switch to White (W).

c.Press input button twice on channel A so that it begins blinking

d.You should now see a white background

e.Press HOLD on channel A

f.Set the mode switch to Luma-Key (L-K)

g.Move Fader all the way to channel B

h.Rotate the fine tune knob to key out black, white, or grays on channel B

i.White background on channel A is revealed

Variation 2 on this effect:

a.Follow above steps for either blue or white background

b.Set cross-fade curve to position 2 (fade to background)

c.Move cross-fader to middle

d.Adjust fine tune knob change value of keyed out colors

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