i guess someone could make one i guess, I got one on my htc phone which is handy at times. I really want a port of Tuxguitar the open source, guitar pro tablature editor.
Or use schism tracker or milkytracker in the meantime.
Add a properly tuned instrument of your preference and use the keyboard to play them.
Record yourself a properly toned sound, loop it, and use it on the programs.
Edit: Can you use a reference tone? Because you can find sound files on the internet. Like Here . They're in the Reference Aids section on the right hand side. Also, if you sing the note, it might help you lock onto it.