This quick trick applies to audio recordings which were done with using a lapel/boom mic.
Considering that it may take you 1 day to find a suitable freelancer to take over the project, having them understand the presentation style, idea and so forth will take you another 1-2 days. He/she will have to send you their version then you review it before sending it to the client.
First, get this - most clients who hire freelancers remotely was once freelancers themselves. They have been on the freelancing business and they know how it works. In-fact, some are still freelancers at time of their search. So what does this mean? It means that they are aware of most of the things happening in the freelancing world. As a result, they have a clear picture of the kind of freelancer they want to hire.