Harmonicdog · MultiTrack

Privacy Policy

Effective September 22, 2026

This policy explains what information the MultiTrack app for iPhone and iPad handles, what reaches us, and the choices and rights you have. It also covers the Audio Unit extensions that come with MultiTrack. MultiTrack is made by Hamilton Feltman, doing business as Harmonicdog (“Harmonicdog”, “we”, “us”, “our”).

The short version

1.What stays on your device

MultiTrack is built to work entirely on your device. None of the following leaves it unless you send it somewhere yourself.

2.Features that use your local network

Your device asks for your permission before MultiTrack uses your local network. These features send data directly between your devices, and none of it passes through us.

3.Information we receive

3.1 When MultiTrack contacts our website

MultiTrack connects to harmonicdog.com for three things:

None of these requests includes an identifier, an account, or anything about your songs. Like any web server, ours keeps an access log of every request it receives, whether it comes from MultiTrack or from your browser. The log records your IP address, the date and time, the page or file requested (a help page’s address shows your language), and the technical details your device sends with the request. For MultiTrack, those details are the app’s name and build number and your operating system version.

We use these logs only to run our website, keep it secure and fix problems. We don’t use them to identify you or combine them with anything else, and our server deletes them automatically after 14 days. Neither MultiTrack’s requests nor our website use cookies.

3.2 When you contact us

If you email us, we receive your email address, your name if your email includes it, your message, and anything you attach, such as a song, a recording or a screenshot. We use it only to answer you and to fix the problems you report.

3.3 Purchases and subscriptions

Apple sells and processes MultiTrack’s upgrades, subscriptions and free trials through the App Store, under Apple’s terms and privacy policy. Apple doesn’t give us your name, email address, Apple Account or payment details. We receive only sales and subscription reports from Apple that don’t identify you, such as how many of each upgrade were sold in each country.

3.4 Crash reports and diagnostics from Apple

If you’ve chosen to share analytics with app developers, Apple sends us crash reports and diagnostics when MultiTrack has a problem, and gives us aggregate usage statistics. Apple doesn’t identify you in them, and we use them only to find and fix bugs. You can turn this on or off at any time in Settings › Privacy & Security › Analytics & Improvements › Share With App Developers.

3.5 Beta testing

If you test a beta version of MultiTrack through Apple’s TestFlight, Apple shares with us what TestFlight provides to developers. That can include your name and email address, your device and the build you’re using, and any feedback, screenshots and crash reports you send. We use it only to improve MultiTrack.

3.6 What we don’t collect

We don’t collect your location, contacts, photos, advertising identifier, or browsing history. MultiTrack doesn’t track you across other companies’ apps and websites, and it contains no code that lets anyone else do so.

4.How we use information, and our legal bases

We use personal information only for the purposes below. Each purpose also shows the legal basis that laws such as the GDPR ask us to name.

Purpose Information used Legal basis
Delivering help pages, update notices and news about our apps Server access logs Legitimate interests: providing the features you use, and telling you about our other apps, which you can switch off
Keeping our website secure and working, and preventing abuse Server access logs Legitimate interests: security and reliability
Answering your questions and fixing the problems you report Your emails and attachments Performance of our contract with you, and legitimate interests in supporting our customers
Finding and fixing crashes and bugs Crash reports and diagnostics from Apple and TestFlight Legitimate interests: making MultiTrack reliable
Meeting legal obligations, and establishing or defending legal claims Any of the above, as needed Legal obligation, and legitimate interests in protecting our rights

We don’t use your information for advertising or profiling, and we don’t make decisions about you by solely automated means.

5.Who we share it with

We don’t sell personal information. We don’t share it with anyone for advertising, including “cross-context behavioral advertising” as California law defines it.

6.Other apps and services you choose

7.Where your information is processed

Harmonicdog is based in the United States, and our website’s server is there too. Our email provider, Apple, is a US company. If you live elsewhere, the information described in section 3 is processed in the United States, where data-protection law may differ from yours. We apply this policy to it wherever you are.

8.How long we keep it

We may keep information longer if the law requires it, or to resolve a dispute.

9.Security

We protect the information we hold with reasonable technical and organizational measures. MultiTrack’s connections to our website are encrypted with HTTPS. Access to our server and our mailbox is limited to Harmonicdog. We keep as little information as we can, for as short a time as we can.

No system is completely secure, so we can’t guarantee absolute security. If a breach affects your personal information, we’ll notify you and the authorities where the law requires it. Wi-Fi transfer has its own precautions, described in section 2.

10.Children

MultiTrack is a general-audience music app. It’s rated 4+ on the App Store, but it isn’t directed at children. The app doesn’t ask anyone for personal information, so a child can use it without providing any.

We don’t knowingly collect personal information from children under 13, or under the minimum age that your country’s law sets. If you believe a child has sent us personal information, for example in an email, contact us and we’ll delete it.

11.Your choices

12.Your rights, and how to use them

Depending on where you live, you may have the right to:

To make a request, email support@harmonicdog.com with “Privacy request” in the subject. It’s free. We’ll confirm we’ve received it within 10 business days, and respond within 30 days, or sooner if your local law requires it. If we need more time, as some laws allow, we’ll tell you why. You can ask someone else to make a request for you, and we may ask for proof that you authorized it.

What we can find. MultiTrack doesn’t give you an account or an identifier. Usually, the only information we can link to you is our email correspondence with you, so we’ll reply only to the address you wrote from. Server logs aren’t linked to anyone. If you tell us your IP address and roughly when you used MultiTrack, we’ll look for matching entries before they’re deleted after 14 days.

13.Region-specific information

13.1 European Economic Area, United Kingdom and Switzerland

Under the EU and UK General Data Protection Regulation (GDPR) and the Swiss Federal Act on Data Protection, the controller of your personal information is Hamilton Feltman, doing business as Harmonicdog. You can reach us at support@harmonicdog.com.

13.2 United States

Several US states give their residents privacy rights, including California, Colorado, Connecticut, Delaware, Indiana, Iowa, Kentucky, Maryland, Minnesota, Montana, Nebraska, New Hampshire, New Jersey, Oregon, Rhode Island, Tennessee, Texas, Utah and Virginia. Some of these laws may not apply to a business of our size, but we honor the rights in section 12 for everyone in the United States.

California

This section is our notice at collection and privacy policy under the California Consumer Privacy Act, as amended by the California Privacy Rights Act (CCPA). In the past 12 months, we have collected the following categories of personal information:

Category What it is Source Purpose Disclosed for a business purpose to
Identifiers IP address; your email address, if you email us Your device; you Running and securing our website; answering you Our web host; our email provider
Personal information described in Cal. Civ. Code § 1798.80(e) Your name, if your email includes it You Answering you Our email provider
Internet or other electronic network activity Access log entries: the page or file requested, the date and time, app and system details Your device Running and securing our website Our web host
Audio, electronic, visual or similar information Songs, recordings or screenshots you send us You Fixing the problems you report Our email provider

Section 8 gives how long we keep each category. We don’t collect sensitive personal information. We haven’t sold personal information or shared it for cross-context behavioral advertising, and we have no actual knowledge of selling or sharing the personal information of anyone under 16.

As a California resident, you have the right to:

Section 12 explains how to use these rights. An authorized agent may make a request for you.

Shine the Light. We don’t disclose personal information to third parties for their own direct-marketing purposes.

Do Not Track and Global Privacy Control. We don’t track you over time or across third-party websites or apps, and we don’t let anyone else collect information about your online activities through MultiTrack or our website. Because there is no tracking to stop, a Do Not Track signal doesn’t change what we do. We treat a Global Privacy Control signal as a request to opt out of sale and sharing, although we do neither.

Appeals

If we decline to act on your request, you can appeal by replying to our decision with “Appeal” in the subject line. We’ll respond within 45 days and explain the outcome. If you’re not satisfied, you can contact your state’s Attorney General.

Nevada

We don’t sell covered information as Nevada law defines it. You can still ask us not to, and we’ll honor your request.

13.3 Canada

We handle personal information under the Personal Information Protection and Electronic Documents Act (PIPEDA) and applicable provincial laws, including Quebec’s Act respecting the protection of personal information in the private sector.

13.4 Australia and New Zealand

We handle personal information in line with the Australian Privacy Principles in the Privacy Act 1988 (Cth) and with New Zealand’s Privacy Act 2020. Sections 3 to 8 describe the kinds of personal information we collect, how we collect and hold it, and why.

13.5 Japan

We handle personal information in accordance with the Act on the Protection of Personal Information (APPI).

13.6 Brazil

Under Brazil’s General Data Protection Law (LGPD), our legal bases are legitimate interest, performance of a contract and compliance with legal obligations, as set out in section 4. You have the right to:

You can also petition the National Data Protection Authority (ANPD). Our contact for data protection matters is Hamilton Feltman, at support@harmonicdog.com.

13.7 Everywhere else

Wherever you live, you can ask what personal information we hold about you, and ask us to correct or delete it. We’ll respond as your local law requires, and we’ll try to honor your request even where the law doesn’t require it.

14.Changes to this policy

If we change this policy, we’ll post the new version on this page and update the date at the top. If a change materially affects how we handle your personal information, we’ll also tell you in MultiTrack’s release notes or in the app before the change takes effect. Where the law requires your consent to a change, we’ll ask for it.

15.Contact us

For questions, requests or complaints about privacy, contact:

Harmonicdog (Hamilton Feltman)
Email: support@harmonicdog.com. Please include “Privacy” in the subject.
Web: harmonicdog.com