This listing is for a mint condition Crane Song Syren. This is one of the most versatile preamps found in the 500 series format. You can go from a fairly clean sound to tube smoothness. You can also get great saturation effects by cranking the gain. This can be a go to for vocals, bass, electric guitar, and many more instruments. It has an open and color switch, hi pass filter, mic d.i switch, 3 step pad, phase reverse, and phantom power. If you have any questions, feel free to ask!