Heritage Audio has introduced its i73 Pro family offering varying I/O and features. These USB-C audio interfaces feature built-in Class A 73-style preamps. The i73 Pro One is a 2-in/4-out USB-C-based desktop design with an integrated 73-style preamp. The new i73 Pro 2 is a 2-in/4-out USB-C-based desktop design with dual integrated 73-style preamps, while the i73 Pro Edge us a 12-in/16-out, USB-C-based desktop design with dual integrated 73-style preamps.