An Applescript to cycle the audio input and output sources between two (or more) audio devices

switch_audio.applescript

on alfred_script(q)
    set output_devices to {"Display Audio", "Generic USB Audio Device   "}
    set input_devices to {"Display Audio", "Generic USB Audio Device   "}
    set device_keywords to {"speakers", "headphones"}

    tell application "System Preferences"
        reveal anchor "output" of pane id "com.apple.preference.sound"

        tell application "System Events"
            tell process "System Preferences"
                set target_idx to 0
                if q is not "" then
                    repeat with idx from 1 to count of device_keywords
                        if (item idx of device_keywords is q) then
                            set target_idx to idx
                            exit repeat
                        end if
                    end repeat
                else
                    repeat with idx from 1 to count of output_devices
                        set device to (row 1 of table 1 of scroll area 1 of tab group 1 of window "Sound" whose value of text field 1 is item idx of output_devices)
                        if (selected of device) then
                            if (idx is (count of output_devices)) then
                                set target_idx to 1
                            else
                                set target_idx to idx + 1
                            end if
                            exit repeat
                        end if
                    end repeat
                end if
                if target_idx is not 0 then
                    select (row 1 of table 1 of scroll area 1 of tab group 1 of window "Sound" whose value of text field 1 is item target_idx of output_devices)
                    tell application "System Preferences"
                        reveal anchor "input" of pane id "com.apple.preference.sound"
                    end tell
                    select (row 1 of table 1 of scroll area 1 of tab group 1 of window "Sound" whose value of text field 1 is item target_idx of input_devices)
        			set script_str to "/usr/local/bin/growlnotify --image /System/Library/PreferencePanes/Sound.prefPane/Contents//Resources/SoundPref.icns -name 'Audio switcher' -m 'Switched audio to " & item target_idx of device_keywords & "'"
                    do shell script script_str
                end if
            end tell
        end tell
        quit
    end tell
end alfred_script

The devices in this example match my Thunderbolt Display and my USB sound card. Update the script to suit your own setup. The sound card I have does actually have three spaces at the end of its device name. I have no idea why.

Are you able to share the alfred workflow? i cannot seem to get it to work but could be related to Mavericks.