Thanks for your comment. Maybe you're right. These YT examples are really nice. Even though I can hum or sign accurately (thus this has clear advantage over playing), I am more inclined in getting track of my melodies early (i.e. what I am actually crafting, is it F#, G or G# scale, etc.), so I don't think voice-way is the right solution (maybe I'm wrong, as it would be more efficient assuming good recording and looping devices, still it's not that good for every kind of music), but definitely interesting one.