Can be done, but you'll need to plug in the scanner, once the x36hp file comes up, double click, open user rec file, drag so all recordings are highlighted (left click, hold, drag down till all highlighted), delete them all, start fresh.
A pretty handy trick for the ones you do want to keep is to rename one of the folders, and add recordings from other folders to it. Kind of handy if you wish to keep all recordings for a specific event. I currently have one with over 862 audio files and the scanner handles it the same as one with only 100.
Can be done, but you'll need to plug in the scanner, once the x36hp file comes up, double click, open user rec file, drag so all recordings are highlighted (left click, hold, drag down till all highlighted), delete them all, start fresh.