I am looking for an application for mixing two mp3 files and output one mp3
The Application will mix an instructional audio file that is locked into the application prior to being delivered to the customer. The customer must be unable to extract this audio file or edit it.
I must be able to change this instructional audio file for different audio files to meet the need of my customers.
When the customer receives the application loaded with their instructional audio file they need to be able to load either a single or multiple mp3 files to be a backing track for the duration of the instructional audio file, which could be upto 1 hour long. The customer then needs three controls,
1. volume of instructional audio mp3
2. Volume of backing audio mp3
3. Publish control to publish the mixed audio.
The customer needs to be able to preview the mixed audio so they can adjust the volume of the mp3s prior to publishing.
The customer needs to be limited to publishing no more than two mixed end products. After two or three published mp3's the application must prevent any further use.