Support
How to get help without exposing your license key.
For purchase or license activation help, start with your Gumroad receipt. For app-use questions, include enough detail to reproduce the issue.
Purchase or license help
Reply to your Gumroad purchase receipt or contact humaninstrumentsupport@gmail.com. Keep the receipt available if you need to activate Full Access on a new browser or device.
Never post or share your full license key publicly. If you need to describe a key in a support message, refer to it generally rather than pasting the full value.
What to include
- browser and version, such as Chrome, Brave, Safari, or Firefox;
- device type, such as Windows laptop, Android phone, iPhone, or iPad;
- whether you were using Free Demo or Full Access;
- what you expected to happen;
- what actually happened;
- any visible error message.
New browser or device
Full Access is stored locally in the browser after activation. If you switch browsers, clear site data, or use a new device, open the app and activate again with the license key from your Gumroad receipt.
Missing or unavailable completed tracks
Completed tracks are stored only in the browser and device where they were created. They do not sync, and clearing site data or using private browsing can remove them. If one saved track is marked unavailable, delete that record and complete the track again. A browser-storage error does not prevent you from using Build or playback.