Have you considered using a professional voice actor to bring your project to life and enhance the connection with your audience?
The example I go to often is Jurassic Park. If you don't believe audio doesn't matter to the audience, imagine watching Jurassic Park without sound. It loses its impact almost completely.
The same goes for your demo & promo videos. Few things will turn off your audience more than poor-quality audio, or someone who is not speaking clearly enough to understand what they're even trying to tell you.
Investing in proper tools or outsourcing to professionals will help eliminate any of those "lost in translation" issues and ensure you ge the best ROI possible from your resources.
Let's chat about your next project any time -
david@davidgilbertvoiceover.com.
Cheers!