Line6 DL4 expression pedal

["Michael Peters" <mp@mpeters.de>]

after trying the EV-5 without success (it only changed the delay speed) I
finally gave in and bought an EX-1, the official Line6 expression pedal - 
it
has a mono plug, other than the other expression pedals, and I thought it
should do the trick. But I don't get it - there is a pattern in how this
pedal behaves, but I don't grasp it, and I can't find a good explanation
anywhere online.

Could a kind soul please explain to me how to set the parameters when in
loop sampler mode? whatever I try, the pedal changes delay speed. How can I
set the mix, for example, without changing the delay speed or regen? what 
do
I have to do, step by step?

-Michael