well ..... I have another question related to HD500x and external pedal, I need your help/suggestion.... 
  
In my guitar story I have collected 5-6 pedal, quite vintage, like TC XII Fhaser, Boss DD-2 Delay, CE-2 Chorus (Clone), BK Tube-Driver, Fuzz, Flanger,  TC Nova Delay..... well .. Now I build a Effects looper using a PIC MCU with 8 send-return loops all in mono. 
  
The question is: HOW to connect the HD500x to the Looper?? in other words, Using main IN and OUT or the FX send -return?.... what I want to do is to use some internal effects emulation (like compressor or equalizer) and external ones.... 
  
Hope it's clear.....!!!! 
  
Any Help??!!! 
  
Rino