Thanks again, Jim. I've only just become aware of your reply.
The darned clicking is continuing to annoy me and is likely to continue doing so...
Does anyone know of any specific settings on the 166xl that avoids the problem, or maybe you know somebody in the UK who can do the mod Jim mentioned earlier?
I've looked a little into the Aphex 651 Expressor but it appears to only really exist in the US.
The following is more or less off topic; I don't want to distract from my main points above
I need to get a non clicky powerful compressor/expander somehow or other!
I was originally quite happy with how my Drawmer LX20 worked in general, and have only been trawling through other units since the control knobs became crackly on the LX20. Drawmer told me they no longer have spares for it. The LX20 however is generally quite 'basic' and does noticably 'swallow' on low frequencies, thereby affecting the overall compression much like some other units. However, it has loads of gain and really brings up low levels.
Before the DBX and the Alesis I mentioned earlier, I also tried a Drawmer DL241, but I found it didn't significantly raise low levels during compression regardless of how I tried to set it. Presumably it doesn't have much gain in that area.
Lee