The I/O Modules are the sound and soul of Symphony I/O Mk II, and represent over 30 years of Apogee R&D and design excellence. These powerful Modules deliver Apogee’s core competency: superior sounding digital audio recording. With 3 available I/O Modules and an 8 channel mic preamp module, you can choose from base configurations or expand to grow your studio’s capabilities. Symphony’s I/O modules are designed to future-proof your investment in flagship Apogee sound quality. If you own an original Symphony I/O, the Symphony I/O Mk II chassis can increase the longevity of your system by offering backwards compatibility with first generation 2×6, 8×8, 16×16 and 8 channel mic preamp I/O modules.