This is probably the ugliest compressor ever produced but it's the sound that matters right? The big attraction with this plug is that you can draw the compression on a graph. I'd strongly recommend this to anyone who is new to dynamics. It's a good tool for learning.
As usual Melda provide almost no instructions. To get the graph feature to work click "custom shape". This disables several other knobs on the display, namely threshold, ratio, knee and knee shape, so don't bother turning any of these and disregard their values. Note that you can't maximize to 0db either when using the custom shape.
Another thing to keep in mind, especially if you're new to this - depending on your attack time quite a bit of your transient could be escaping before the graph begins to effect the signal.
The line bouncing back and forth horizontally on the graph represents the input level (post the gain knob). The first bar beneath the graph is volume reduction that occurs during compression. The second bar is output level (post the output gain).
This is also a really good plug for doing expansion or other non standard compression.