VST, Plugin, Free, Mixing, Frequency, Spectral Analysis. It is often extremely useful to see the frequency spectrum of your individual tracks and your final song. For example, you may want to see if your bass is dipping into the same frequencies as your kick drum. Unless you have perfect audio monitoring equipment and perfect ears, you will need some help to make sure you don’t have overlapping frequencies. There is a free plug-in from Roger Nichols called Inspector that allows you to see the frequencies used by an audio signal. This tool, in combination with a filter or EQ plug-in, allows you to visually sculpt your instrument’s frequencies. In other words, this can help you spot problems with your mixes and improve clarity. Every electronic music producer should have this plug-in in their sonic arsenal.