custom pulse signal 9401

Hi,

I am using NI 9401 and I would like to generate custom pulse signal which is generated in the loop. At the beginning the user determines the pulse sequence e.g. 

30 ms LOW, 20ms HIGH, 15 ms LOW, 25 ms HIGH 0.1ms LOW, .... Then I can programatically build the analog or digital waveform. Now I would like to use this waveform and generate the TTL signal. I would like to use the inbuilt counter as in this case here to be able to generate high frequency such as 1MHz etc..... any idea ???