Biamp Commercial Audio ALINP Rotary volume controlActive local input panel, White In lots of applications a local input control can be a useful and above all a timesaving product. No complex devices with multiple buttons to control just plug in and control the volume, nothing more, nothing less! Especially in rooms where very often a music source or microphone is used, the ALINP plays its role. Think of classrooms where each hour a different teacher uses the classroom and wants to plug in his laptop