At the moment I am selling mp3s - I had a few speakers who produced talks on my behalf for my business. I also got these talks transcribed, so I have a document/pdf to go with it. I would like to be able to offer the transcription as an additional cost item in the same product. For example, an mp3 is £7.50, and there is an transcription (doc/pdf) for an additional fee. What I don't want to do is to offer the transcriptions for sale by itself, without the accompanying mp3. If they want the transcriptions, I want to know they have the mp3 in the first place. If they could get the transcriptions without the accompanying mp3, it might stop them from buying the mp3. I have a worldwide audience, and most of them have *some* understanding of the English language. I'd like to take advantage of the benefits a transcription can offer, and make money from them as transcriptions are currently an expense-only. I'd be very grateful if you could make such a facility available. in advance, thank you.