Output constant or slow changing values to DAC channels

Hello, I wonder if someone can help me get to grips with something that I believe should be quite simple.
I made a prototype in Max, without going into details, it outputs constant or LFO signals to 8 DAC channels on my audio interface. I want to know how to do this with open frameworks, or any other library I can drop into the project. Not sure if I need to buffer it or not, the oscillations will never be even close to audio rate, but it would be nice to get them nice and smooth, so if I was to use them to frequency modulate an audio-rate oscillator you wouldn’t hear the steps.
Thanks for your help.