What makes one instrument sound different from another is more a matter of its characteristic loudness envelope (attack-decay-sustain-release shape) than of its characteristic timbre (tone quality). You can prove this to yourself by setting the loudness envelope of a synthesizer to emulate:
Now try to emulate first an acoustic guitar and then a flute, using the same envelope for both and a different timbre for each. Which aspect of sound - loudness envelope or timbre - is more important in fooling your ear?
The botar gives the player the same capability that wind players, bowed string players and singers have: continuous control of loudness over the length of a phrase. As a result each phrase can have a unique loudness envelope.
The botar gives string players who don't want to learn a bowed instrument the ability to sound like a horn, a bowed instrument or a voice.