How do i let users modify patch lists?

I'm designing an application in which the user needs to create and modify patches. I would like the interface to have a list of user patches, followed by sliders an textual input boxes to modify parameters. I am aware that i could easily put together the interface with Core Data, however, i don't need a lot of the data management features of Core Data, and would like a simpler way to create mutable lists. Can someone please explain how I could do this?

Can NSDictionary hold multiple values for one key, or do i create multiple dictionaries with the same keys? I am still not very familiar with the NSKeyedArchiver and it's subclasses.

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