Oh, sorry, didn't start recording yet but only looked at previous recordings. So there is no way to adjust level for already recorded entries?

EDIT: OK I played a little with test recording and recording and I just don't get it: trigger level can be set as low as 20 while my former recordings had level 16. Changing that level in any way doesn't affect old recordings at all, they still look like having slept like a baby. And according to current rendering I guess I would need some level of 12 or even lower but not >20. (Am I right: lower level means more sensible to movement?)
How does it work actually?