I purchased and used this item about six months ago. I have only confirmed its operation. All accessories are included. I am also listing this item on other flea market sites, so please understand that I will immediately remove the listing if it sells. Below are the official product specifications and handling instructions, quoted as follows. Thank you. ●Level: Adjusts the volume of the overdrive signal. ●Drive: Adjusts the saturation of the overdrive. ●Blend: Adjusts the ratio of the clean signal to the overdrive signal. The clean signal always maintains unity gain, and the overdrive signal can be adjusted with the Level knob. Fine adjustments can be made by combining the Level and Blend knobs. ●Grunt Switch: Switches the strength of the low frequencies. You can select from three types of bass boost levels before the clipping stage: Fat/Thin/Raw. ●Attack Switch: This switch functions similarly to the "Ultra Hi" option found on many bass amplifiers. This switch allows you to switch the strength of the high frequencies when distorted. The Boost setting makes the presence clearer. The Cut setting provides a warm, rounded sound. The Flat setting does not affect the tone. ●Low: ±12dB@100Hz ●Low Mid: ±12dB@1kHz ●Hi Mid: ±12dB@2.8kHz ●Treble: ±12dB@5kHz ●Direct Output: By using the balanced output of the XLR terminal, you can directly output the bass sound to a PA or studio mixer. This output also has a ground lift switch. ●Parallel Output: Thru-outputs the input signal. Effective for creating a parallel system. Darkglass Electronics