Develop an Apple Watch version of my iOS audio processing app.

There is an existing iOS audio processing app for loading audio files from iTunes library, audio from Dropbox and buying audio loops from in-app purchase and loading into visual pads of the app and playback when user taps each loaded pads. Now I need an Apple watch app that can control the ios app so when user set up the app on iOS devices, they can use the Apple watch app to control the app on iOS phone of iPad. 1- User can only Upload and edit pads on the main phone or ipad, 2- Itunes upload, multiple sessions, in app purchase, loading of pads, free samples, will all still be done from phone side. 3- On Apple watch: watch will show current loaded session. 4- On Apple Watch: only 4 visual pads can be shown, and you can swipe left to review other pads. when user taps a loaded pad on apple watch, it should play on the phone as ususal and when user taps another loaded visual pad on apple watch should change as normal on phone or iPad connected to the watch. 5- On Apple Watch: slide tempo should be controlled from watch, Volume, and BPM sync button can also be controlled from watch. 6- there main audio playout will still be from the iPhone or iPad but the apple watch will serve as a controller for the app.