Extensionx values determine frequencies; y values determine amplitudes. Stable ranges for a & b tend to be between -3 to + 3. c & d between 0.5 and 1.5. There are combinations within these ranges that are unstable, so be prepared to tweak this oscillator.
| minfreq, maxfreq |
iteration frequency in Hertz |
| a, b, c, d |
equation variables |
| x0 |
initial value of x |
| y0 |
initial value of y |