How to use 3Band Waveform and Stacked Waveform | CDJ-3000 Tutorial Series 3Band Waveform separates the high, mid, and low frequencies into different colours so you can glance at the screen and easily understand how a track sounds. Blue = low frequencies Amber = mid frequencies White = high frequencies And, if you switch on Stacked Waveform, you’ll see the waveform of the master player and the waveform of the track you’re cueing on another CDJ-3000. This helps you work out where to start your mix