Free member but limited one page access

[hmcgpp]

Hi,

The S2 member plugin was referred to me by my cousin who used it on a website he created - so far I'm really impressed with the software. I'm testing things out with the free version thus far hoping to find a solution to the following problem.

I have a number of Mp3 resources, each Mp3 has a specific topic
Access to each Mp3 will be free but...
I want each visitor to have to register to access the protected Mp3 file content (level 0 - free option - I presume)
I need the visitor to have access only to a one specified post/page that contains the embedded Mp3 file on a given topic. I want to be able to control which embedded Mp3 file page they get access to. Ie - Topic A, not topic B, C, D, etc.

I have reviewed the site videos and the options within the plugin settings but still not sure how to go about this despite the myriad of options available to me.

I imagine in the process of registration you can pre-determine which topic they could get access to but not sure how this is possible. Can it be determined by the incoming link to the website?

Interested to hear your thoughts...

On a slightly related matter, does anyone have any suggestions for protecting Mp3 content within wordpress?

Thanks in anticipation.

Cheers,
Heath