Ensure you are getting your software through the official Mac App Store to guarantee the latest security patches and updates.

: A newer, cleaner design with customizable patch lists, allowing you to hide icons or rename concerts directly in the sidebar. Enhanced Controls : Screen buttons for can now adjust BPM in precise 1-step increments. System Requirements and Cost : The software is available on the Mac App Store : While Apple's minimum requirement is 4GB of RAM

This usually happens if you downloaded via a browser that interrupted the checksum. Redownload the file, or check your Mac's date and time (incorrect dates break SSL certificates and signature checks). Alternatively, use the Terminal command hdiutil verify MainStage-3.6.1.dmg .

Go to MainStage > Preferences > MIDI and click "Rescan MIDI." Ensure "Auto-demix by channel" is unchecked unless you are layering sounds. Also, note that 3.6.1 has a known quirk where it forgets controllers after sleep mode—restart MainStage before soundcheck.