DspMixFx ur44 doesn’t work in my iPad Pro

Hi everyone, I bough a IPad Pro and I tried to connect my ur44 (4years old) to my iPad and It’s working with my cubase 3 (cubase recognise my ur44, and its not blinking) but I want to play live music with the software DspMixFx and this apps in my iPad doesn’t work, can someone help me with this problem please.