The rear panel sports four additional fixed-level 1/4" inputs to accommodate more line-level devices, and an ADAT optical input for use with an external 8-channel A/D converter. The Scarlett 18i8's 24-bit / 192 kHz converters ensure that signals are captured and reproduced with detail and clarity. With four balanced 1/4" line/monitor outputs, two 1/4" stereo headphone jacks, and independent control of the headphone and speaker volume settings, the Scarlett 18i8 can simultaneously feed multiple monitoring systems and outboard effects processors. The virtual loopback function empowers podcasters with an easy mix-minus setup for taking calls without the caller being distracted by a delayed audio return signal. Traditional 5-pin MIDI I/O is provided for seamless integration of MIDI equipment such as a keyboard or sound module, and S/PDIF coaxial ports allow proper routing of stereo digital gear. The Scarlett 18i8 connects to your Mac or Windows computer via USB and is powered by the included external power supply. The extensive software bundle includes music production software, virtual instruments, plug-in effects, loops, and more—plenty of tools to kick-start your inspiration.