The improved version of the Microtubes B7K Ultra offers all the versatility and sonic possibilities of the original, plus: a user-loadable cabinet simulation impulse response, a micro-USB B port to connect to a PC/Mac to load a different virtual cabinet via the Darkglass Suite, a 3.5mm headphone output with cabinet simulation, and a balanced XLR output with switchable cabinet simulation. Description • Master – While the Level knob sets the output of the overdrive section, the Master volume adjusts the overall volume of the unit. Ideal for fine-tuning the output in Clean mode. It also serves as a DI level control. • Blend – Mixes the clean input signal with the overdriven signal. The clean signal remains at unity gain, while the volume of the overdriven signal is set by the Level knob, allowing for fine-tuning of the mix ratio. • Level – Sets the volume of the overdriven signal. • Drive – Sets the amount of saturation in the overdriven signal. • Grunt – When engaged, this feature provides a massive low-end boost to thicken your sound. • Attack Switch – Sets the amount of treble content to saturate: The "Boost" setting emphasizes clarity and presence in the treble content. The "Flat" position leaves this register untouched, while the "Cut" position reduces the amount of saturated high frequencies. Specifications Bass: +/-12 dB @ 100 Hz Treble: +/-12 dB @ 5 kHz Output: Direct Inputs: Auxiliary, Headphone USB Dimensions: 12 x 10.7 cm Weight: 0.7 kg