I have both the DS40CR, and DSL100 HR. If it weren't for the MIDI capabilities of the HX FX, I would not have bought it. You can change anything the 6 button footswitch can using the HX FX. I used to own a JVM410H (Man I miss that head. Gonna get another one day) and used the HX FX with that as well. It worked great. The 6-way 91016 Marshall pedal, and the ones that come with the JVM all use a proprietary connection that uses any standard 1/4 cable. The EXT AMP via 1/4 trs cable on the HXFX can only switch the channels , and turn the loop on and off.