While anyone can apply to upload sound effects, currently music submissions on Synchedin are invite-only.

Synchedin is our partner site that offer unlimited, royalty-free, high quality audio downloads for commercial use. Users can sign up for free to browse through their full catalogue, with helpful filter and search tools to find exactly what you’re after. Once you’re ready to access unlimited free downloads, music subscriptions are $4.99 per month, while sound effect subscriptions are just $3.99 per month.

Unfortunately, music uploads are by invite-only, however anyone can request a creator account to upload sound effects for users to use in their next YouTube video, blockbuster film or anything in between. To apply, sign up at Synchedin, then head to the Account drop-down in the upper right corner and choose Creators Apply. Once you’ve been approved, you’ll be able to upload tracks, and add titles, tags and comments.