I made a list for my own reference not too long ago... And here it is..
"HDACTIVE" - HD Radio Signal Active (For MitchJS's HD Radio tuner)
"SURF" - Radio Surf Mode (Same as "SCANMODE")
"STEREO" - Radio Stereo (Works with DLink, Cinergy & HQCT ONLY)
"SCAN" - Radio Scan Mode (Indicates whether FREQ+/- will "seek")
"HDSIGNAL" - HD Radio Tuner Signal Strength (Road Runner Only -- for MitchJS's HD Radio Tuner only)
"RSIGNAL" - Signal strength of the radio station received
--- Radio Support Labels ---
"HDARTISTX" - HD Artist on Sub Channel X
"HDTITLEX" - HD Title on Sub Channel X
"HDSUB" - Current HD Sub Channel
"HDSUBCOUNT" - Number of Sub Channels Available for current Station
"RDSNAME"/"RDSTEXT" - Those also may provide information about the Current Station for HD Radio
"FMAM" - Inficates if the current frequency is FM (True) or AM (False)
"FREQUENCE" - Radio FrequencY (Yeah, it's misspelled to support older MediaCar skins)
"STATION" - Current Station Name (Radio)
"PRESET" - Current Preset Number (Radio)
"RDSNAME" - RDS Name of Station (if any)
"RDSTEXT" - RDS Text from Station (if any)
"RDSSIGNAL" - RDS Signal Level (SiLabs Radio Card Only)
"PTY" - RDS Program Type currently received (PTY)
"HDSUB" - This allows you to select the HD Radio SubChannel for the current station.
Example: "HDSUB;1" (First Channel -- default)
"HDSUB;2" (Second Channel).. and so on from 1 to 6
"RADIO" - Loads the Radio Player Screen (radio_player.skin) -- Same as "LOAD;RADIO_PLAYER.SKIN;RADIO"
"PLAY" - Cycles through a Play/Pause state of current song. (RR Only) When Radio is ON, acts as "PRESETMODE"
"STOP" - Stops the playback of current song. (RR Only) When Radio is ON, acts as "SCAN"
"FREQ+" - Increases Current Radio Frequency
"FREQ-" - Decreases Current Radio Frequency
"SCAN" - Turns On/Off Scan mode in the Radio Screen. In scan mode, freq+/- act as a seek function.
"SURF" - Same as "SCANMODE" (below)
"TUNE" - Shows NUMPAD to enter a frequency/channel to tune into on Radio/XM/SIRIUS
"PRESET" - Shows NUMPAD to enter a preset number to jump to (Radio Only)
"RADIOMUTE" - Mutes/Unmutes the radio
"FUNCTION" - Shows up the RADIO_MENU_FUNCTION.SKIN menu.
"ADD" - This shows the OSK and allows you to enter a name to save the preset for current frequency.
"MOVE" - This allows you to use UP/DOWN to move a radio preset into a position of liking.
"MODIFY" - This shows the OSK and allows you to edit the name of the selected preset.
"DELETE" - This deletes the selected preset.
"SCAN" - This searches any stations and adds them to the playlist as presets
"SCANMODE" - Toggles scan mode. This works with MP3, TV and Radio as well
"ADDPRESET" - This shows the OSK and allows you to enter a name to save the preset for current frequency
"DELPRESET" - This deletes the selected preset
"EDITPRESET" - This shows the OSK and allows you to edit the name of the selected preset
"PRESETUP" - Switches to Next Preset
"PRESETDOWN" - Switches to Previous Preset
"SEEKUP" - Seeks (finds) next Radio Station
"SEEKDOWN" - Seeks (finds) previous Radio Station
"TUNEUP" - Changes Frequency UP by 1 MHz
"TUNEDOWN" - Changes Frequency DOWN by 1 MHz
"FINEUP" - Changes Frequency UP by 0.1|0.2 MHz (0.1 is used when Allowing all frequencies)
"FINEDOWN" - Changes Frequency DOWN by 0.1|0.2 MHz (0.1 is used when Allowing all frequencies)
"MONO" - Toggles Mono/Stereo mode of Cinergy 600 and Radiator supported FM tuners
"PRESETMODE" - Toggles Preset Mode ON/OFF. When the RADIO is ON, "NEXT"/"PREV" work as Seek UP/DOWN.
In Preset Mode, "NEXT"/"PREV" switch presets UP/DOWN instead of seeking the radio.
"SEARCHPRESETS" - Enter the search preset mode (Radio). This clears and adds found presets onto the preset list.
"LOCAL" - Toggles the Local Mode for the Radio Presets. While in local mode, any changes presets
that are searched, added, edited or deleted do not affect the main list of presets.
"AF" - Toggles the RDS Alternative Frequency function.
"TA" - Toggles the RDS Traffic Announcement function.
"PTY" - Toggles the RDS research by program type (PTY).
"FMPRESET" - Save/Load a Preset for the current Radio frequency. You can use this to make preset buttons for
the radio feature. Presing and holding the button will save the current frequency to the name
specified to this preset. Pressing the button normally will load the named preset frequency.
Example: "FMPRESET;PRESET1" (load/save current frequency from/to preset name PRESET1)
"RADIOBAND" - Toggles AM/FM Band