Terms of sale and use

Last updated 11 November 2026.

These terms cover buying, downloading and using sOURnd engines and synths on https://sournd.com. Please read them with the licensing page, the refund policy and the privacy policy.

Who we are

sOURnd is run by Box Of Rules, the trading name of James Harold Gordon Cartwright, a sole trader in England. Address: C/O Brennan Herriott & Co, 1 Blatchington Road, Hove, England, BN3 3YP. UK VAT number GB458915449. Email hello@sournd.com or use the contact form.

What you get

• Apache-2.0 engines (the licence is shown on each engine's page) are licensed under Apache-2.0. These terms do not limit that licence.
• Other free engines and paid engines are closed libraries. You get a licence to use them in your own plugins and products as the licensing page describes. You do not buy the engine itself, and you may not extract, decompile, resell or redistribute it on its own.
• A one-off purchase gives that licence for good, with updates.
• A plan gives the licence for every engine it covers while the plan is active. Today that is the Engines plan, covering every paid effect engine. Plugin versions you release while it is active stay licensed after it ends. New releases and updates need an active plan.
• Selling plugins or games that contain engines needs nothing more from you: there is no royalty and nothing to register. The licensing page says what each licence covers.

There is no account. Your email address is your login: we send a link that works once, and then this browser stays signed in for 30 days (see the cookie policy).

What sOURnd is for

Every engine is an effect on audio you supply or an instrument you play. AI should enable creators, musicians and producers, never replace them (see how we make things).

You may not use our engines, our services or anything we host:

• to generate music or audio from prompts or other non-musical input;
• to build, train, test, fine-tune or supply data to a system that generates music, audio or performances, or to help anyone else do so;
• as a part of such a system, or of a product or service built on one;
• to imitate a specific artist's voice or performance.

Using an AI assistant to write the code that builds our engines into your own plugin or game is allowed: that is making a tool, not generating music.

We may refuse or end access for anyone who breaks this section, and any licence used this way ends.

Prices, VAT and payment

• Prices are in pounds sterling and include UK VAT at 20% for buyers in the United Kingdom. Outside the UK there is no UK VAT.
• We sell to buyers in the European Union at the same prices, with no VAT added.
• You pay through PayPal. The contract starts when PayPal confirms your payment, and we email a receipt with a link to your VAT invoice. Every invoice is also on Your engines.
• If a price on the site is clearly wrong, we may cancel the order and refund you in full before you download it.

Plans

• A plan renews automatically every month or year at the price shown when you subscribed, until you cancel.
• You can cancel any time on Your engines or in your PayPal account. You keep access until the end of the period you have paid for. We do not refund part periods (see the refund policy).
• If you move from one plan to another, tell us. We refund the unused part of the old plan, in proportion to the time left, within 7 days.
• We will give you at least 30 days' notice by email before a plan's price changes, and you can cancel before it does.

Downloads and your right to cancel

Engines are digital content. You have 14 days from purchase to cancel, unless you have started the download: when you prepare a download we ask you to agree that it starts now and that you then lose the right to cancel. Your statutory rights for digital content that is faulty or not as described are not affected. The refund policy explains both.

Our responsibility

We supply engines with reasonable care and skill and as described. If an engine is faulty, tell us and we will fix it, replace it or refund you. We are not responsible for losses that were not foreseeable, for loss of business or profit when you use the engines in a business, or for problems caused by your own systems. Nothing in these terms limits liability that the law does not allow us to limit, such as for death or personal injury caused by negligence, or for fraud.

Suspension

We may suspend or end a licence if you break these terms or the licensing terms, if a payment is reversed or charged back, or if an order was refunded. A refunded engine's licence ends.

Changes and law

We may update these terms; the version on this page when you buy applies to that purchase. These terms are governed by the law of England and Wales. If you live in Scotland or Northern Ireland you may also bring a claim in your local courts.