The "Classic Electro Bass" or the "Vintage Organ" patches in 1.5.7 have a specific color and warmth. When Apple updated the app, they may have updated these patches, subtly changing the attack or decay. For a producer working on an album, that micro-difference is enough to demand a downgrade.
Before looking for third-party solutions, Apple has built a legitimate system to let you download legacy apps. Here is the official way to get the last compatible version of GarageBand for your device, which in many cases will be version 1.5.7 or something very close to it.
Are you running into a specific during the process?
Locate GarageBand and use the cloud icon to install the compatible legacy version. Troubleshooting GarageBand Issues on iOS 15.7
The most reliable method to acquire GarageBand on iOS 15.7 relies on your Apple ID purchase history. Apple maintains a repository of legacy app versions for accounts that have previously owned the software. Launch the native on your iOS 15.7 device.
running iOS 17 or later (a friend's or family member's phone works perfectly). Log into your Apple ID on that newer device's App Store.
2 ports USB printer sharing switch . Manual/Iron shell The "Classic Electro Bass" or the "Vintage Organ"