#1
First off I have a Peavey 6505+ the back of the head is plugged into the GT-10 multi effects pedal, out of the external effects on the gt10 I have an ISP Decimator. But for some reason when I turn the ISP Decimator on I do not hear a difference. Do I have to do something with the GT-10 to make the external effects work? Should I plug it in differently? Please help
#2
well first off, what are you running into what?

it'd be handy to know what ports/jacks everything's connected to.
Belief is a beautiful armour but makes for the heaviest sword.
#3
Hit the master/pedal fx button and scroll along till you see the send/return icon, make sure that it's switched to on. You may have to reposition some things in the signal chain menu as well, hope that helps.
Psst ! The fat man walks alone.
Gear :
Modded Strat w/ Iron Gear Pup's

Marshall JCM 2000 - DSL 401

Boss GT-10
#4
Just put the ISP decimator between the GT-10 and the 6505+.
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#5
Do you have the manual, page 15 shows the wiring diagram for using external pedals.
Psst ! The fat man walks alone.
Gear :
Modded Strat w/ Iron Gear Pup's

Marshall JCM 2000 - DSL 401

Boss GT-10
#6
thanks everyone! im going to try and find the manual and do what you said klaf5 but if I cant figure it out im just going to try what raijouta said to do