karaokekoverband -- 2

I want to make an app for karaoke for musicians. Meaning you will have access to for beginning around 50 songs that will be available for guitar, bass, keyboards and drums. All tracks will be done by a professional studio and recorded track by track. I will need some features to loop some parts of the song, change key and tempo (if possible). There will be a possibility to show the video of the progress of the song by chords, maybe the fingering on a tablet or fretboard, anyway I can explain this whenever you are available to start the project. I will be doing songs depending on different level skills and not specifically popular songs but challenging songs. Tracks can be muted, change volume and put in solo mode and one track that can record the output. What can I expect for the budget and how long will it take? If you need more info please check out the attached docs - those contain basic things that I need for the app and a little video explaining the system for schools (it is a demo of the intro to music for schools on which I based the idea for the app).