I have an iPod Touch 5th gen. It has iOS 9.3.5. I thought I could not install Garageband because it requires iOS 10.3. However, there is a way to do this, so here it is in case others are having the same problem.
Using a macbook or similar desktop type computer and using the same AppleID account as what is on your iphone, ipod, ipad, touch etc., log into the iTunes Store and “Get” Garageband. You don’t have to install it on the device.
back on the device (in my case iPod Touch 5th gen), go to the App Store, search for Garageband, and click on Get for Garageband if it isn’t already showing as yours. It will ask if you want to download a previous version or something like that. Click yes, and it works! … or at least it did for me. Just downloading it now, will post what the results are like when it’s all installed.
Freedrum Devs, although this works for me, for people who don’t have access to another computer in order to do this, any chance of building samples into the iOS Sensorware app like in the Android version so that those of us with slightly older … but not that old … iOS equipment where we can’t get Garageband to install can play our Freedrums?