Configuring HTML Spider to only return specific files

[Keltin]

I recently purchased a subscription to an old time radio website, and would like to download all the episodes of a series using FDM instead of using their "basket" system.

The format of their website is in ASPX, with each page being identified with ?ID=###.

I would like to format the HTML Spider to pull the MP3 file link of the underlying page from the main series page. Each time I try to do this, I get nothing, or I get too much information.

What I'm looking to do is only download the MP3 from the next page under the main series page.

Any suggestions on how to set it up?