Settings up the V-1HD for your chroma keying effect can be challenging. Here's a article that will help you setup your lighting for your keying that you should consider taking a look at prior to trying to key: 

• Chroma-key Tips

 

Mastering a Key gets easier the more you get familiar with setting your lighting setup, effects and dialing parameter in prior to your production. Chroma key composites video shot against a blue or green background against a different background video. If you are not careful Chroma key composition sometimes leaves color or small artifacts at the edges of the extracted video, but this is not a malfunction.

 

• Press the [MEMORY] button to display the MEMORY menu.

 

• Use the [TRANSFORMER] "UP" "DOWN" buttons to navigate and select “EFFECTS A” or “EFFECTS B.”
  
  
• Use the A/B fader to select the compositing effect to assign to the EFFECTS A or B [ON] button. You have a choice of the following Chroma-keying effects:

1. GRN-C.KEY - Chroma Key Green (Keys out Green)
2. BLU-C.KEY - Chroma Key Blue (Keys out Blue)
   
   

• Press the [MEMORY] button to quit the menu. This will save your effects settings in your units internal memory
  
  
• Press the EFFECTS A (or B) [ON] button to turn on the effect (lighted).

 

• Press the [A-1] through [A-4] and [B-1] through [B-4] buttons to separately select the background and the picture you want to display in the foreground. *The video on the bus at the position where you turned on the effect is displayed in the foreground. 

1. [EFFECTS A] knob This adjusts the amount of keying for the foreground video
2. [EFFECTS B] knob This adjusts the degree of edge blur for the foreground video

 

• To turn off an effect, press the EFFECTS A (or B) [ON] button a second time