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Are Compressors Normally Supposed To Have A "Decay" Knob???
Over literally just the last couple of hours and after some advice from my previous thread, I have decided to start reading and learning more about the technical side of music production. So I decided to finally learn about how to use a compressor and what they do. The reason I'm asking if they're normally supposed to have a decay knob is because of the following information that I read on a site:
INPUT........To set the level in.
THRESHOLD........This sets how high the signal must reach before the compressor kicks in.
RATIO.......This sets how much compression is applied in ratio to the Db rise in signal level above the Threshold.
ATTACK.......This sets how fast the compressor kicks in once the Threshold has been breached.
***DECAY***........This sets how fast the compressor lets go, once the input signal has dropped back below the threshold.
LINK ......Links the two sides for stereo operation.
OUTPUT......Sets the output signal level.
(Link to this page: http://www.pcmus.com/compressors.htm)
So first of all, I want to know if this looks like reasonably accurate information. and secondly, why is it that on the two compressors that I have, (The deffault Fl Studio Compressor)

and the SV-315MK2 Compressor

dont have a decay knob?
Is it because the release knob is basically the same as a decay knob??
And also, if there is anyone out there that can explain what some of the knobs on the MK2 compressor do that weren't mentioned above, that would be great. e.g. the "crush" knob, the "hold" knob, The knob in between the "crush and "hold" knobs that has the "I" and "H" options, etc....
Cheers 
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