Typically, Litestep's functionality is handled by 'modules' - add-ons that act as front-ends for such things as media players or system clocks, etc.
The theme I'm currently running [my own] uses Geekamp for the 'audio player'....which front-ends Winamp.
;**********************************************************************
;* G e e k A M P version 1.9.71 *
;**********************************************************************
WinampStartNormal
*Shortcut "Vol Dn" -52c -12 volume-dn1.png volume-dn2.png volume-dn3.png #2 !AMP_VOLUMEDOWN
*Shortcut "Vol Up" -52c -12 volume-up1.png volume-up2.png volume-up3.png #2 !AMP_VOLUMEUP
*Shortcut "Prev" -52c -12 01rw1.png 01rw2.png 01rw3.png #2 !AMP_PREV
*Shortcut "Play" -52c -12 02play1.png 02play2.png 02play3.png #4 !Play
*Shortcut "Pause" -52c -12 03pause1.png 03pause2.png 03pause3.png #3H !Pause
*Shortcut "Stop" -52c -12 04stop1.png 04stop2.png 04stop3.png #2 !Stop
*Shortcut "Next" -52c -12 05ff1.png 05ff2.png 05ff3.png #2 !AMP_NEXT
*Shortcut "Open" -52c -12 06open1.png 06open2.png 06open3.png #2 !AMP_LOADFILE
That's the relevant section of the step.rc