Initial frequency is Hz
Shoals game directions:
Listen to the notes around you, aim for the centre of the shoal.
if you are the highest note then select a lower number.
if you are the lowest notes then select a higher number.
When confused by choice, always react to the nearest sound.
You may choose to be silent sometimes.
Continue like this until the predetermined signal to stop.
[This version of Shoals runs inside a HTML5 audio-enabled browser, no audio files, no flash, all generated in-browser]