The Sidekick Passive DI Box by Hosa Technology makes it easy to connect your guitar, bass, or keyboard directly to a mixing console! It features an isolation transformer that transforms an instrument-level signal to a line-level signal.se the Sidekick to “go direct” for a pure, clean, noise-free tone that is perfect for Digital Signal Processing (DSP) or throw the INST/LINE switch to LINE position to allow your amp to drive the line for a natural, overdriven tone.