Hi Pierre,
 
   Not a problem. Here is a little diagram I worked up for you.
 

 
I too have the Rodenberg GAS. Great gear!
 
How is the M200 reverb for bass?
 
Best, Brian

Cool Brian,
I've never tried that. I also use a Lexicon MX unit(MX400), I love it just for the reverb, the other time based FX are pretty nice too.

wow !!! it would be work wow !!! lot of thanks for your prompt and kind answer, I will try that ! The Lexicon MX200 is great and enough for bass play !! for my use of course ;-)

Not a problem Pierre. Yes it should work just fine. The boost however I would just use on the bridge pickup  before the regular preamp input for solos, but that's just me. Using it in the loop should be fine too.
 
Elwood and Pierre thanks for the lexicon feedback guys.
 
Best, Brian

you are welcome !!