This may be a dumb question , not sure. I use IR1A by Mellowmuse for my impulses . Just now noticed that changing the LEN / ST knob greatly changes the sound of the impulse. Do most of these impulse loaders automatically set the impulse to the correct settings, because I noticed that it tells you the impulses length , for example .02 seconds. I'm guessing LEN /ST means length? Do I have to turn the knob until LEN/ ST matches the length of the impulse? I know for guitar wet should be full and dry should be none...