Continuous different frequency waveform generation

Hi,

  I have a problem with my signal generation Vi.

I use a Ni PCI-6221 board to generate arbitrary waveform.

In my application i need to change waveform and frequency on the run and the next waveform MUST start after the last point of the first one.

I attach an example of what i need to do. Don't care about the shape of the waveform but only the frequency.

As you can see in the example when i change waveform, the new waveform immediately start truncating the waveform in execution.

I need the new waveform to start at the end of the first one.

NOTE: I MUST use "continuous samples" or "regeneration" 'cause i could not be fast enough to write continuously the waveform when i generate 100hz waveform or similar.

could anyone help me?