EQ (equalization) is a very useful concept and tool in audio recording. If you want to brush up on what it is all about, check out our article here: What is Equalization, Usually Called EQ? When first learning how to use EQ, it can be confusing to understand what settings to use for what sounds. It is often very handy to have a a guide that tells you where to start for common sounds, like voices and tons of different instruments. The entry at the below link will give you such a guide. Not only is this a great reference, but it can help you start to learn where on the frequency scale these sounds live, in general, giving you a foundation for understanding how to shape your sounds for the best possible audio.