Sorry, ik wat iets te snel met het posten van mn probleem. Na wat google werk ben ik achter de oplossing gekomen via deze link en de uitleg in een notendop (in het Engels)

http://uk.line6.com/support/thread/85889?tstart=0

In a nutshell: Low Volume Mode does not mean that the DT25 operates at a Low Volume - it means that it uses full amp models rather than just pre-amp models for the different topologies. It is designed so that when using the DT25 at a low volume level you can still get authentic overdriven amp sounds from it. So when you use the DT25 at high volumes then it behaves very differently and in some cases the results are way louder! So engage LVM only when the DT25 is being used at him on a setting below 50% master volume and you want your amp to sound like an amp being pushed hard but you still want the audible result to be nice and quiet so you don't disturb anyone.

Dus onder de 12 uur werkt de normal mode wel en dan gaat ie toch verrekte hard!! ;-)