Just look at the MPSCS page in the DB, enter the red & blue frequencies (control channel & alternate control channels) for the Detroit Simulcast site. Depending on where you are, you may also be able to receive the Southfield, Romeo, Northville, Flat Rock, &/or Western Wayne sites.
The other thing you need to do with the PRO-96 is if you enter more than one site, you will need to separate each site with at least one non-trunked frequency, otherwise the -96 locks on the first control channel it sees & ignores the others.
Example: Det Siml freqs / VHF freq / Southfield freqs / VHF freq / Northville freqs / VHF freq -- and so on. (I used VHF as an example but it can be any non-trunked frequency-VHF, UHF, 800.)
Feel free to PM me if you need further guidance.