POD HD500 4 cable method FX return clipping problem

[Damien19]

Good day guys,

 

POD HD500 have been a great unit UNTIL....I'm using full 4 cable method.

 

Problem: I'm getting DIGITAL DISTORTION when I crank my Laney Ironheart pass 6 o'clock.

 

Elaboration:

I'm using STOMP mode since LINE produce insane hiss.  My guitar ---> IRT--->Vox 1x12 celestion G12M is super quiet even @ hard rock Alice In Chain kind of gain setting, running without any noise gate. 

 

Request:

Please help me guys, I've been using POD HD500 for 4 years and this problem put me away from POD HD for post pre-amp stage efx processing.

 

Any tricks to solve this problem? If so, please share. Treat me like a newbie , I'm seriously need a solid solution or else I just sell this POD and go for analog setup.

 

Best regards,

Damien