SPL’s new Marc One brings the practical application of switching between monitoring sources without a lot of hassle, and is a great tool for optimizing mixes. Size-wise, it’s not that much bigger than a typical 2-channel DAW interface, with a front panel that covers switching between two sets of speakers/monitors, along with a level control knob. With a Stereo/mono selector that also has a stereo reverse function, the user gets a comprehensive ability to work the mix for various applications, such as video or TV work. In the middle position, all input signals are equally loud. To the left, the analog stereo inputs get louder and the USB input signal gets quieter. So, it blends between analog inputs and digital input (USB) – very useful, indeed. ▼ Article continues below ▼