Most skins include a 'system message' area where event messages and control tooltips will appear (on the default skin it is located just under the timer). Check this message area when moving the mouse over a control to get a description about the control's function. Descriptions that appear in parenthesis '()' are right-click functions.
KEYBOARD ACCELERATORS
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-- Playback --
Load files Q
Previous track W
Next track E
Stop R
Pause T
Play Y
Load folder Shift+Q
Stop After Current Shift+R
Play Selected Shift+Y
Seek ahead 5 sec RIGHT Arrow
Seek back 5 sec LEFT Arrow
... 10 sec Shift + Arrow
... 20 sec Ctrl + Arrow
... 40 sec Shift+Ctrl + Arrow
Volume Up Ctrl+UP Arrow
Volume Down Ctrl+DOWN Arrow
-- Playlist --
Add files INSERT, Ctrl+O
Add folder of files Shift+INSERT
Delete selected tracks DELETE, Ctrl+D
Delete unselected tracks Shift+DELETE
Select all Ctrl+A
Toggle selected tracks Ctrl+X
Shuffle playlist S
Repeat current track D
Repeat all tracks F
-- Playlist Navigation --
Up UP Arrow
Down DOWN Arrow
Page-up PAGE-UP
Page-down PAGE-DOWN
First track HOME
Last track END
Play current ENTER
Play track 'n' Playlist Number + ENTER
Launch 'Play selected' Shift+ENTER
-- Playlist Navigation within Search Control --
Find All TAB
Find Next DOWN Arrow
Find Prev UP Arrow
Play Current Match ENTER
-- Skin Control --
Load base skin Ctrl+0
Load skin mode 1 - 9 Ctrl+1...9
Open skin extension 1 - 9 Shift+1...9
Open skin child window Shift+0
Open skin browser Ctrl+S
Next skin mode Alt+S
Refresh skin F5
-- Misc --
Plugin Browser Ctrl+B
Edit Track Info Ctrl+E
Segment Editor Ctrl+G
Music Browser Ctrl+M
Preferences Ctrl+P
Always on top Ctrl+T
-- Equalizer --
Equalizer Presets Ctrl+Q
Next EQ Preset Alt+Q
Previous EQ Preset Alt+Shift+Q
-- Visual Effects --
External Visuals Ctrl+V
Full Screen Visuals Ctrl+Shift+V
Next Visual Alt+V
COMMAND-LINE SWITCHES
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/play Start playing
/play d:\trackXX.cda Play track 'XX' on CDROM 'd:'
/play c:\mediafile Play 'mediafile'
/add c:\mediafile Add 'mediafile' to the playlist
/pause Pause CD (if playing)
/stop Stop CD (if playing)
/trkfwd Next track (if playing)
/trkbwd Back one track (if playing)
/eject d: Eject CDROM 'd:'
/ejectall Eject all CDROMs
/closeall Close all CDROMs
/autoplay Used for windows CD auto play feature,
won't override QCD's current state.
/ontop Set QCD to be on top of all windows
/notontop Unset QCD to always be on top
/hide Minimize QCD
/show Shows QCD
/noactivate append this option to stop activation of
player with any of the above commands
/shutdown Shutdown QCD
/safestart Runs QCD without initializing plugins
/newinst Runs multiple instance of QCD
/class classname Runs QCD with different window classname