Mobile development

I need an Android app. I would like it designed and built. As well as an identical iOS app. I'm a guitar player who has an idea for app that'll help any player of all levels. Tha basic concept is the user will record a melody they came up with on their own. Next they want to preview what this melody would sound like coming out of a guitar, acoustic or electric. But before they preview I feel there should be a pitch level fader or knob of some sort. Because we all have different voice and the device can record the basic melody but to the young boy or title looking to play something deeper, well they can't because their voices can't go that deep so that's why I believe a pitch control prior to previewing the sound it will make out of a guitar. When the preview us to the users liking they can hit the "TRANSCRIBE" button and this will take the user to the next page which will have the melody at the out here they chose written out in tablature form which is an easier way to read what notes need to be played on the guitar. Essentially what noise u make with ur mouth this app will transcribe it as accurately as humanly possible. And saves thrm the hours, days, maybe weeks it would've taken them to learn that . And when all is said and done they learn how to play it and now they made original music...instead of copying their favorite artists songs over and over which gets boring very fast. Every musician wants to be able to play original music and I believe this app will get that done