For markup, you can use baseFrequency to combine baseFrequencyX and baseFrequencyY.
The larger the base frequency number, the more quickly the colors change. The number must be positive and provides good results if the number is less than 1. If no number is provided, the value is assumed to be zero.
- Scalable Vector Graphics: Filter Effects, Section 15.25.27
Microsoft Developer Network: [Windows Internet Explorer API reference Article]