Last updated: 14 September 2026
These terms govern your use of KRATEO SetMaster at
setmaster.krateo.me. They apply whether you use the free tier
or a paid plan. If you do not agree with them, do not use the service.
They are written to be read. Where a term matters in practice, it says so plainly rather than hiding behind wording. The one you are most likely to be caught out by is section 10, so read that one even if you skip the rest.
SetMaster is operated by Lorenz Kolb, a sole trader based in Germany. Full operator details are in the Impressum. You can reach us at mastering@krateo.me.
For paid plans there are two relationships, and it is worth knowing which is which. Polar Software, Inc. is the Merchant of Record: Polar is the seller for the purchase itself and handles payment, invoicing and tax. We provide the service. These terms cover the service. Polar's own terms cover the sale.
SetMaster masters recorded DJ sets. It analyses the set, detects sections, measures loudness and kick consistency, generates a gain automation curve and normalises the result. You can see and adjust every automation point before rendering. That transparency is the product.
What it is not: a mastering engineer. It is an automated tool. We do not promise a particular artistic result, that the output will suit a specific club, platform or release, or that it will meet any given loudness target you have in mind. Mastering is a matter of taste, and you are the one who decides whether the result is good. Listen before you use it.
The free tier exists so you can hear what the service does to your own audio before paying anything.
You keep every right in the audio you upload and in the master we produce. We claim no ownership of either.
We do not use your audio to train models, and we do not share it. This is not a policy we reserve the right to change quietly; it is a term of this contract.
You grant us one narrow permission, and only this: to store, process and transmit your audio for the purpose of producing the master you asked for, for as long as we hold the file under section 10. That permission ends when the file is deleted. It does not extend to promotion, demonstration, analysis for any other purpose, or letting anyone else use it.
You confirm that you hold the rights you need to have your audio processed, or that your use is otherwise lawful. You are responsible for what is in your set.
To be realistic about it: a recorded DJ set almost always contains other people's music. We process it for you as a private technical service and we do not publish it, share it or make it available to anyone else. Whether you may then release, sell or broadcast the master is a question between you and the rights holders, and this service does not answer it or grant you any right to do so.
You may not upload content that is unlawful, or that you have no right to have processed.
Technical limits: 4 hours maximum duration and 8 GB maximum file size. The duration is the real limit; the file size is there to stop abuse.
| Plan | What you get |
|---|---|
| Free | The first 60 minutes of your set, mastered and delivered as an MP3. A longer set is not rejected, it is cut to that length. No payment, and no card needed. |
| Pay per set | One master, full length, as a WAV. A single purchase for a single set. |
| Solo | Up to 5 masters per month, full length, WAV. The count runs with your Polar billing period, not the calendar month. |
| Pro | Unlimited masters, full length, WAV. "Unlimited" means normal use by one working DJ; see section 12. |
Current prices are shown at checkout before you pay.
SetMaster deliberately has no sign-up, no password and no user profile. Your email address is the only identity, and links are the only credential. Two consequences follow, and both are on you rather than on us:
Payment runs through Polar as Merchant of Record. Polar handles your payment details, the invoice and any tax. We never see your card details.
Subscriptions renew automatically for successive periods until cancelled. You can cancel at any time through Polar, using the link in your receipt. Cancelling stops the next renewal; it does not shorten the period you have already paid for, and you keep your plan until that period ends.
If you are a consumer in the EU you normally have 14 days to withdraw from a contract for digital services, without giving a reason.
Because Polar is the seller (section 1), the purchase contract and the withdrawal right run between you and Polar. Polar's terms and its process apply to exercising it, and we will help you reach them if you ask.
You do not have to work out which of us owes you this. Send your withdrawal to us at the address in the instruction below and it counts as sent in time; we pass it to Polar. The instruction and the form are reproduced here in full so that you have them either way.
Right of withdrawal
You have the right to withdraw from this contract within 14 days without giving any reason.
The withdrawal period will expire after 14 days from the day of the conclusion of the contract.
To exercise the right of withdrawal, you must inform us (Lorenz Kolb, Belgradstraße 136, 80804 München, Germany, mastering@krateo.me) of your decision to withdraw from this contract by an unequivocal statement (e.g. a letter sent by post or email). You may use the attached model withdrawal form, but it is not obligatory.
To meet the withdrawal deadline, it is sufficient for you to send your communication concerning your exercise of the right of withdrawal before the withdrawal period has expired.
Effects of withdrawal
If you withdraw from this contract, we shall reimburse to you all payments received from you, including the costs of delivery (with the exception of the supplementary costs resulting from your choice of a type of delivery other than the least expensive type of standard delivery offered by us), without undue delay and in any event not later than 14 days from the day on which we are informed about your decision to withdraw from this contract. We will carry out such reimbursement using the same means of payment as you used for the initial transaction, unless you have expressly agreed otherwise; in any event, you will not incur any fees as a result of such reimbursement.
If you requested to begin the performance of services during the withdrawal period, you shall pay us an amount which is in proportion to what has been provided until you have communicated us your withdrawal from this contract, in comparison with the full coverage of the contract.
One practical note on the paragraph above, which describes the mechanics and does not limit it: because Polar is the seller and took the payment, we start the reimbursement and Polar carries it out, so the money returns the way it came. Section 9 says the same thing about refunds generally.
One statutory exception is relevant to a mastering service, and it is why the upgrade screen will not let you choose a plan until you tick a box that says: by choosing a plan you expressly ask us to begin producing your master straight away, before the 14-day withdrawal period has run. You acknowledge that you thereby lose your right of withdrawal: it ends as soon as we begin, and in any case once your master has been delivered. Where you ask for performance to begin immediately and acknowledge that consequence, the right lapses. A master is produced as soon as you ask for it, so this applies to your purchase.
Both of those are true at once, and they answer different questions. The instruction says what the right is and how to use it while you have it. This heading says when it ends. Nothing here shortens the 14 days on its own: the right ends early only because you asked for immediate performance and confirmed you knew what that costs you, which is exactly what the tick records. Until you tick it you cannot buy, and the 14 days run untouched.
You do not have to use this form and you do not have to give a reason. It is set out here because the law requires that you be given it.
(complete and return this form only if you wish to withdraw from the contract) — To Lorenz Kolb, Belgradstraße 136, 80804 München, Germany, mastering@krateo.me: — I/We (*) hereby give notice that I/We (*) withdraw from my/our (*) contract of sale of the following goods (*)/for the provision of the following service (*), — Ordered on (*)/received on (*), — Name of consumer(s), — Address of consumer(s), — Signature of consumer(s) (only if this form is notified on paper), — Date (*) Delete as appropriate.
None of this touches your rights if something is actually wrong with the service. Those are in section 9 and apply by law regardless of anything written here.
Separately from the right above, and regardless of whether it still applies: if the service fails to give you a usable master for a technical reason on our side, email us and we will put a refund through. We would rather refund than argue. Your statutory warranty rights as a consumer are not limited by this and not waived.
How that works in practice, so the wording does not promise more than we control: because Polar is the seller, we initiate a refund and Polar processes it, and the money returns the way it came. Polar applies its own time limits to processing one, so tell us as soon as you notice rather than months later.
One case we would rather state than have you discover: if you complete two checkouts for the same set within a short window, it is possible for both to be charged, because the confirmations arrive independently. You will still get your master. Email us and the second charge is refunded.
Download your master. SetMaster is not storage, not an archive and not a backup. Everything below deletes itself on schedule, and once it is gone we cannot get it back for you.
| What | How long |
|---|---|
| Uploaded audio and rendered masters | 24 hours |
| A master you paid for | 14 days, reachable through the link we email you |
| Download and resume links | 24 hours, or 14 days if you paid |
| Sign-in links | 30 minutes, single use |
| Audio from a render that failed | 7 days, so we can investigate and re-run it |
There is no charge for this. The window runs from your last render rather than your first, so a set you keep working on keeps a live link; it is not something you can extend by asking. If you need a set kept longer, keep it yourself. What we do with personal data, as opposed to files, is set out in the Privacy Policy.
We do not promise any particular uptime. The service runs on a single server and may be unavailable for maintenance, updates or reasons outside our control. A render in progress can be interrupted by a deployment.
SetMaster is young software and is being actively developed. Features may change, improve or be removed. If we discontinue a paid plan you are on, we will tell you and refund the unused part of what you paid.
You may not:
"Unlimited" on the Pro plan means unrestricted normal use by one person. It is not a licence to run a mastering business through one subscription.
If you breach this section we may suspend or end your access. Where we suspend a paid plan and the fault is not yours, we refund the unused part.
We are liable without limit for damage caused intentionally or by gross negligence, for injury to life, body or health, under the German Product Liability Act, and where we have given a guarantee.
For slight negligence we are liable only where we breach an essential contractual duty, meaning a duty whose fulfilment makes proper performance of this contract possible in the first place and on which you may routinely rely. In that case our liability is limited to the damage that was foreseeable and typical for this kind of contract.
Any liability beyond that is excluded.
Read practically, alongside section 10: keep your original recording. Our liability for a lost upload or a lost master cannot sensibly extend to the value of a recording that exists nowhere else, and the deletion schedule is published precisely so that this is never a surprise.
We may change these terms where there is a valid reason, for instance a change in the service or in the law. For anything that materially affects you we will give reasonable notice by email to the address associated with an active subscription, or by a notice in the service. If you do not accept a change, you can stop using the service and cancel. The version published here at the time you use the service is the one that applies.
German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer, this does not deprive you of the protection of mandatory provisions of the law of the country where you live.
If something is wrong, email us first. Most things are faster to fix than to formalise.
We are not obliged to take part in dispute resolution proceedings before a consumer arbitration board, and we do not undertake to do so.
Email mastering@krateo.me. Operator details are in the Impressum.