Digidesign Pro Tools Quad Audio Interface - 16 Bit 4 Channel

Tascam US-428 Digital Audio MIDI Controller 4-Channel USB Mixer Interface - Blue

DigiDesign Quad Audio Interface Pro Audio Tool 16 Bit 4 Channel

DigiDesign Quad Audio Interface – 16-Bit, 4 Channels – Power Tested

Digidesign M BOX Pro Tools Audio Interface With Software, Cable, and Box

Vintage Niche Automation Station MIDI Fader Controller

Native Instruments Audio Kontrol 1 USB Audio Interface