v.* single stream: multiply each pixel by an int or float dual stream: multiply stream 1 by stream 2 single stream: multiply each pixel by an int or float dual stream: multiply stream 1 by stream 2 In single stream mode, v.* multiply each pixel by a value. Streams with int16, int32 and float32 components are processed in their existing component sizes. For yuv images, you can choose to pass along the y or uv components unchanged. In dual stream mode, v.* multiplies each pixel in stream 1 by the brightness of the corresponding pixel in stream 2. If the first stream is int8 then the second stream is forced to int8 as well. If the first stream is float32 then the second stream is forced to float32. You can set additional gain, and define how the second streams values are interpreted using gain and modulation_center messages.

from the library : softVNS Format : External Environment : jitter / max commercial Max 4.x http://homepage.mac.com/davidrokeby/softVNS.html