“Commissioned for the BBC’s make it digital event, the brief was ‘to get children into code’. My installation downloaded the event’s twitter feed in real time and displayed the page’s body text inside the bodies of passing people. Moving their hands around allowed people to scroll through the html/js/CSS.”
The simulation serves no purpose, but its fun. There are 4 versions. I think the third one sounds best (rf-mixer-sim3.maxpat). Its interesting to hear how much spectral distortion happens from multiplying sawtooth waves.
The note relationships in a chromatic scale are based on the 12th root of 2.
An octave has a ratio of 2. An octave is divided into 12 equal steps.
For example, to find the ratio of one semi-tone (half step), on a scientific calculator, use this button:
Here’s the result where x = 2 and y = 12
This Max patch shows the relationships between any two notes and how to calculate the pitch of a note based on the semi-tone interval. You might use it as a starting point to design your own scales. For example, a 13 note chromatic scale. Or relationships based on randomness.