What do the Distillate controls do?

[tcube]

Distillators:  
 
The Distillate photos I've seen typically have the following:
 
2 hat-knobs near the output jack  
1 chicken-head knob on the lower horn
3 toggle switches  
1 do-dad that looks like an LED or a trim-pot-access hole near the output jack.
 
What do they do?

[artswork99]

Here's the control information.  The LED is a power indicator when the 1/4 inch jack is plugged in.

[tcube]

Artswork99,
Thank you very much -- just what I needed.