The Converge Pro 2 128VT Professional Audio DSP Mixer is the industrys most advanced professional audio DSP platform for conferencing and sound reinforcement applications. It outperforms in any size room, audio environment, and application. The 128VT model mixer has 12 inputs with AEC, 8 outputs, built-in VoIP/Skype for Business interface, Telco, USB audio; GPIO, RS232, IP control interfaces; and P-Link and C-Link expansion buses.