Video by ZoomSoundLab via YouTube
Source
Product Specialist Samuel Greene walks you through the built-in Normalization feature of the Zoom Essential Series Handy Recorders. This is available on the H1essential, H4essential, and H6essential.
http://zoomcorp.com/H1essential
http://zoomcorp.com/H4essential
http://zoomcorp.com/H6essential