Based on the comments, it looks like you’ve picked a good problem to solve. And as you’ve discovered, building a product is only part of the work, getting it noticed is just as important.
I have a few suggestions to consider:
- As the musical community is very relationship driven I would prioritize sharing and virality over advertising for discovery. Make it easy to send files to friends and you have a built in promotion.
- To get it in their hands and raise awareness, go where your customers are. Open mic nights, music stores, gigs, meetup, reddit. Talk to people, ask questions about how they record themselves. Post a few flyers on bulletin boards.
- Try to get featured on some music blogs, podcasts, or youtube channels that have a built in audience.