#1
Quick question: I have a Boss CH-1 and DD-3 in my effects loop, in that order, and I'm adding a PH-3, where should that pedal go in the line up?
#2
I'd put it in between the two. Or, you know, do what everyone else does and try every spot it can go (which in your case isn't a lot of places if those are all the pedals you have), to see which sounds best to you.
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#3
Definitely next to the Chorus, it probably doesn't matter if it's before or after as I doubt you'd ever need both at once. Delay is almost always last though.

Also try the phaser before your amp, that can be good too depending what you're after.
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#4
Thank you for the replies! I'm just starting to experiment with pedals so I only have 4 right now.
#5
The most important thing with pedals is to put your delay and reverb at the very end. I don't think the order in which you position your chorus and phaser matters, I believe they will both effect each other in the same way (regardless of order.)
#6
http://www.justinguitar.com/en/GG-050-EffectsPedalOrder.php this is a very helpful lesson I always link.

Contrary to that lesson though, I myself personally (<--- not even sure that's proper English) would put all three pedals in the effects loop if there is one, going Phaser ---> Chorus ---> Delay. Justin and one of the above suggestions say that Phaser should go before your amp though.
The above post is in terms of 'YMMV' and 'IMO', etc...

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