How can I find a software program which will provide all four vocal sounds, if I put my music notation? Soprano, Alto, Tenor, and Bass. In this program I'd like to compose the music and hear the exact sound.
There is an application developed by NCH Software. It's called TwelveKeys Music Transcription and it's able to display the loaded tracks through a visual representation. Access the official page of TwelveKeys to find out more. You can also download a trial version to test it. There is no software configured to display the vocal sounds automatically yet.