Locate the QuickPlayer messaging element (QuickPlayer023Msg) and receive it's
handle. Use this with SendMessageA to send a command; parameter hwnd is, of
course, the handle of QuickPlayer023Msg element, uMsg must be WM_COMMAND (273 /
hex 111, and wParam is the command (id / number) as seen in the list below.
lParam is not yet used. In later versions it may be supported as another
unsigned dword or pointer to a 0-terminated string, depending on command, and
will be explained with the command that supports it.
However, I have not (yet) found a working method to send string( pointer)s
using the SendMessageA api (well I did, but only by passing a pointer from a
string received from fmod.dll to QuickPlayer, and that actually worked), so
this will not work within the next time.

See QuickPlayer for further information about this feature!
I recommend not trying other uMsg commands or sending to another elements!

The commands supported:
-----------------------
600 Show/Restore QuickPlayer
601 Hide/Minimize QuickPlayer
610 Update presets

200 Previous song
201 Play / Restart
202 (Un)Pause
203 Stop
204 Skip/Next song
205 End Song

220 Seek backward
221 Seek forward
222 Volume Up
223 Volume Down
230-240 Volume 0-100%

300 Mark previous playlist item
301 Play playlist item next / end/skip song (Playlist doubleclick action)
302 Play playlist item (skip song)
303 Play playlist item (end song)
304 Play playlist item next
305 Mark next playlist item
306 Select current (/next) playlist item
307 Select random playlist item

318 PageUp playlist
319 PageDown playlist

320 Perform autorefresh
330 Remove autorefresh songs
331 Remove non-autorefresh songs

340 Delayed autorefresh

Following settings toggle (x=0), or set on (x=1)/off (x=2):
39x MP3 Infos
400 Toggle Repeat mode
401 Repeat single
402 Repeat all
403 Repeat random
41x Fading (Fade in/out)
42x Spectrum analyzer
43x Remove missing songs
44x Remove manually skipped/ended songs
45x Remove played songs
460 Toggle end-song-processing
461 End-song-processing: off
462 End-song-processing: crossfade
463 End-song-processing: MiniDisk record mode
464 End-song-processing: stop after each song
465 End-song-processing: Toggle crossfade
466 End-song-processing: Toggle MiniDisk record mode
467 End-song-processing: Toggle stop after each song

510 IR-Sleeptime off
512 IR-Sleeptime +30min
513 IR-Sleeptime -30min
515 IR-Sleeptime: 30min
516 IR-Sleeptime: 60min
517 IR-Sleeptime: 90min
518 IR-Sleeptime: 120min
590 Shutdown immediatelly

