Here is a short video showing how the Joshua Bell Violin interface responds during a performance. At the bottom, you can see the piano keyboard being played. Of course, a violin’s lowest note is G3. However, occasionally you can see notes being played in the bass. Those are keyswitches, that I use once in a while to override the automated articulations.
The center of the screen shows the various articulations alternating, with different types of legato, spiccato, staccato, sustain, diminuendo, and so on. In addition, the slider on the left indicates the dynamics (loudness), while the slider on the right indicates the amount of vibrato.