1. Click on series to sonify. Verify that the series plays the points in order with rising frequency.
2. Both series should play the C-major scale ascending. Series 2 (black series) has inverted polarity.
3. The notes should pan from left to right speaker as the sonification moves along the x-axis.
4. The tooltip should follow the points as they play.
5. Make sure clicking multiple series only plays one at a time.