I've searched the forums for a support thread for this contribution but had no luck.

I have installed this wonderful contribution which allows you to set multiple shipping charges for each product in your catalog. If possible, I would like to be able to have certain shipping charges available depending on the product's quantity attribute. For instance:

Product 1: Brochures
Attributes: Qty: 25 (if this quantity is selected, it offers two shipping charges, one for Priority and one for Rush shipping)
Qty: 50 (same thing, but with a higher shipping charge for both Priority and Rush shipments)

I'm not sure if there is already a contribution for this but I've been looking for 3 days. Maybe I've overlooked it or I just do not understand how they are supposed to function...

Any help would be appreciated.
Thanks in advance.