Thank you for your fast response,
First of All sorry for my Capital letters ASAP was misinterpreted rudely, this was not the intention, I appreciate Midi Designer team, and I have been using it for so many years even when there were no frequent updates for it.
Secondly, It's not convenient to try to use different applications to run my Apple music library "djay - DJ App & AI Mixer" might be a good workaround, but it can't be the ultimate solution, especially if I have so many different apps and automation running form the same iPad, it's really time-consuming to migrate exiting workflow and add a new app to it.
I can find the issue is related to the option "Stay Alive in Background" under the midi options part, disabling it is an easier workaround, I hope the team will do some more research and find a solution where this option can be used along with other apps need to keep running in the background, it sounds like when this option is enabled, the app takes over all background apps and this is what causes other music apps to stop.
Sorry for the long response, and I hope my last findings will help you and the team.