Question: I need a solution that can create custom sound effects for my project without requiring licensing or permissions.

If you need a way to create your own sound effects for your project without having to license or obtain permissions, AI Sound Copilot is a great option. The service will generate unlimited, AI-created sound effects from videos, games and text prompts. All the SFX it generates are royalty-free, so you don't have to worry about legalities. The tool can save you time by providing custom sound effects on the fly with no extra work.

Another option is Audiobox. It can synthesize voices and sound effects based on voice input and text prompts. You can edit audio, stripping out background noise or replacing parts with new sounds, so it can be useful for a wide range of creative tasks. It takes some trial and error, but Audiobox is a powerful tool for creating sound effects from text prompts.

You can also try Stability AI, which offers a collection of generative AI models across several domains, including audio. Its Stable Audio 2.0 model is geared for high-quality music and sound effects, so it should be a good fit for your needs. Stability AI offers flexible membership options, including a free non-commercial tier, so you can try out and use the models without a big upfront cost.