Problem while recording guitar elect with distorsion

[Mathias64000]

Hi

I'm french so i'll try to do good sentences..

Thank for Mixpad, very good, but i have a problem

I have a electric guitar with differents effects (distorsion...) not the effect in mixpad but externals

When i record it with no effect no problem the sound is good

When i record it with distorsion (good hard rock!) the result is that the beginning of recors is good and in a few second the volume level shut down and there is a metallic sound ; it sound like if mixpadwould try to limit volume and power but the result is that volume fall to quasi 0 with an horrible back sound of metallic/robot and sound is change completely.

 

Some ideas ? Thank from france !