Build a Music Production Flash Player + Marketplace like MyFlashStore/Soundgine/Beatstars

Need a music player designed for Music Producer's to sell their own instrumentals for a marketplace website I have in the works. I would like the players to replicate ALL of the features of "MyFlashStore" and "Soundgine's Engine." [login to view URL] [login to view URL] [login to view URL] I am posting this freelance job opportunity for you coding savvy cats to design something for me that encompasses all of the features that Soundgine AND MyFlashPlayer Platinum Membership Level has (except for the custom voice tag feature). What I really like about Soundgine's engine is that it is fully customizable (the text, features, etc.). My favorite feature is the co-production feature on MyFlashPlayer. To achieve this successfully I would like the ability to add a separate PayPal payment gateway field to fill in on the backend for each instrumental loaded. Bonus 1: A feature that is not necessary but would be fantastic to see implemented would be backend access for users selling their instrumentals so they can upload and edit their own works WITHOUT being able to access the Admin's backend or tamper with other user's works. Bonus 2: If this can be done, then please disregard Bonus 1. I would MUCH rather prefer this feature. Replicate this marketplace [login to view URL] so that every user who purchases and utilizes the music flash player store you are creating ends up on this marketplace. SUMMARY: Basically just replicate/improve what you see on the links I provided. Make it elegant and stand out in design. If it's easier for you to develop a website along with the music player/chart then do that. Perhaps model it after [login to view URL] but keep the marketplace chart like [login to view URL] because it is simplistic in nature and ideal. If no website, then at least have it so there's an elegant backend feature for the users to upload their works to. Have code that I can paste into Squarespace too. I will be paying developers upon creation of a successful product top dollar if I am 100% satisfied and decide to use their creation. Any questions please contact me and I will get back to you asap.