There is no such thing as a stupid question, only stupid people
That said, the 4CM is to specifically designed to put effects both before the preamp of your amp AND after the preamp. The effects loop puts your effects after the preamp. Now, as was mentioned earlier, if you don't need to put effects before your preamp (these effects would most likely be things like compression, wah wah, overdrive), then you can use the amps effects loop and insert your effects unit, get your chorus, reverb and delay (as well as flanger, phaser, pitch shift, etc) AND be able to avoid the extra noise that often accompanies the 4CM.
Hey thanks a lot for the replys I'm gonna mess with rp1000 tonight just running thru effects loop and see if I can tell any difference thanks!
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Personally, I would rather have a wah, compressor and drive on my pedalboard, than use the 4CM...if that is possible...more effective, IMO.
Botton line, try the 4CM and listen. If it's too noisy, run the effects through the loop and listen again. It's really about what works for you. BTW, different amps react differently to the 4CM, in my experience. If you don't need the effects in front of the preamp, no reason to run it with 4CM...just avoid that all together
Good Luck!