For the music during a problem solving arc, I think you can pick some kind of ambience, so there is sound, not silence, it's important the game doesn't lose its own sound no matter what moment to keep the player immersed, because you have no control of the player's own environment, silence in the game just means they hear other sounds instead from their own environment and it is definitely going to bring them out of immersion, your player may even assign a sound themselves which may not fit the mood of the game you want to achieve. (which I had to do it for my stream) Glad you enjoyed the stream vod, I enjoyed streaming it as well, I miss doing this. lol