When I started following HMH and working through the code, the sound part was one of the most difficult things for me. So, now that I'm trying to do it again without looking at the source, I thought Ill just visualize the buffer to see what is going on. And I was stuck with a visualization that I thought was windows not updating part of my buffer for a day or so... but I think I figured it out now and I just wanted to show sinewave I visualized :P

I recorded it, if anyone wants to "see" the soundbuffer getting filled: