1) this really depends on the software you're using. To use your PC keyboard you need an App that can make use of a virtual claviature (virtual piano keyboard). To edit the notes it must offer some kind of manual editing mode. Really depends on the software.
2) Not that I know. I think Steinberg had Software that was capable of scanning Note Sheets and play it, but that's something diffrent.
I think it's also very hard to seperate instruments since music is based on harmonics and the characteristics of instruments are the exceptions from the harmonics. So it will be very hard to know what characteristics are part of what voice.
Well if you "insert music" as Midi file then it's no problem since the instruments have never been collapsed to one stereo sound, unlike e. .MP3 etc.
There is a method to remove the vocals from a song. This is used by Karaoke apps. But it simply removes components that are mixed identicly on left and right channel, a common feature of the lead vocals in songs, where all other intruments use other pan settings.
2) Not that I know. I think Steinberg had Software that was capable of scanning Note Sheets and play it, but that's something diffrent.
I think it's also very hard to seperate instruments since music is based on harmonics and the characteristics of instruments are the exceptions from the harmonics. So it will be very hard to know what characteristics are part of what voice.
Well if you "insert music" as Midi file then it's no problem since the instruments have never been collapsed to one stereo sound, unlike e. .MP3 etc.
There is a method to remove the vocals from a song. This is used by Karaoke apps. But it simply removes components that are mixed identicly on left and right channel, a common feature of the lead vocals in songs, where all other intruments use other pan settings.