You could use the SHIFT in the bottom corner to revert the tracks all to the same size. And then assign the Zoom tools in the Key commands menu. I have my horizontal scrolls set to Ctrl > Left Arrow, and Ctrl > Right Arrow respectively. And then for the horizontal zoom I have set them to Ctrl > Up Arrow, and Ctrl > Down Arrow. This way when you zoom in and out all the tracks will be of the same size. [url=http://www.macprovideo.com/forum/upload/upload/server/php/savedfiles/files/mpv_39636_14931_Zooms.png] [img]http://www.macprovideo.com/forum/upload/upload/server/php/savedfiles/thumbnails/mpv_39636_14931_Zooms.png[/img] [/url]