[Zubersoft]

If you sort by date created on the songs tab, you should be able to locate the last song added from the CSV, and select all the songs down to the first one added from the CSV. You can use the companion application to shift-select if you have a large number of songs to delete. I haven't found a good way to implement a ranged selection on android yet (I need to look into adding options when the checkbox is long pressed).

Mike