Add this 'AIM Option 3 - A8MP' to your Symphony chassis to get an extra 8 channels of Preamps (8 Mic preamps with 4 instrument inputs and 8 insert points). The I/O Modules are the sound and soul of Symphony I/O, and represent 25 years of Apogee R&D and design excellence. These powerful Modules deliver Apogee's core competency, superior sounding digital audio recording. With 5 available I/O Modules, you can choose from standard configurations or customize the following: channel count, analog to digital input, digital to analog output, mic preamps and digital I/O. You compose your Symphony I/O.