Here’s a structured content piece you can use for a blog post, support page, or video description about the software download. How to Download and Install Software for the SainSmart DDS 120 Signal Generator If you own a SainSmart DDS 120 function generator, you already know it’s a compact, affordable tool for generating sine, square, triangle, and sawtooth waveforms. However, to unlock its full PC-based control and logging capabilities, you’ll need the correct software.