Cannot project 8-bit depth images in pattern sequence using SW command

Hi,

I am using python to control the DLP3000. I am using Software command (Next) to go from one pattern to another in the sequence. Using checkerboard 1-bi depth patterns all works great. However, when trying to project a sequence of 8-bit sinusoidal pattern I see that the DLP projects only binary images (like stripes). 
What can be the cause? 

My configuration setting is:

settings = {
            "depth": 8,                      # Bit depth
            "num": 3,                        # Number images
            "include_inverted": 0,  # Inverted included yes or no
            "trigger": 0,                    # [0, 1] [SW command, Auto trigger]
            "delay": 0,                      # Initial delay microseconds
            "period": 20000,           # Full microseconds
            "exposure": 10000,      # Exposure microseconds
            "led": 0                            # [012] [RGB]
            }

I have tried several period and exposure timings and nothing seems to work although I should remember that I am controlling the sequence move by software command.

Thanks a lot for your time, Pepe