Hi boingy,
Thank you for your message.
Cubasis LE gets unlocked from demo mode, once a compatible hardware device is connected.
It is not required to have the hardware permanently connected to use the app afterwards.
However it can appear, that the app has to be unlocked again after some point.
In any case, uninstalling the app, or re-installing the app to another iPad device requires the app to be unlocked again.
Hope that helps.
Best wishes,
Lars