Extra Menu: Device
From Audacity Development Manual
The Extra > Device menu provides commands for changing the playback and recording devices and settings, instead of using the dropdown menus on the Device Toolbar.
Change Recording Device Shift + I Extra
Displays the Select recording Device dialog for choosing the recording device, but only if the "Recording Device" dropdown menu in Device Toolbar has entries for devices. Otherwise, an recording error message will be displayed.
Change Playback Device Shift + O Extra
Displays the Select Playback Device dialog for choosing the playback device, but only if the "Playback Device" dropdown menu in Device Toolbar has entries for devices. Otherwise, an error message will be displayed.
Change Audio Host Shift + H Extra
Displays the Select Audio Host dialog for choosing the particular interface with which Audacity communicates with your chosen playback and recording devices.
Change Recording Channels Shift + N Extra
Displays the Select Recording Channels dialog for choosing the number of channels to be recorded by the chosen recording device.