xcal:
if volume AND vwm case is not handled, so that wont work. What I ended up doing was:

xTaskbarOffset 60
IF playerman
xtb1 160
ELSE
xtb1 0
ENDIF

IF volume
xtb2 50
ELSE
xtb2 0
ENDIF

if vwm
xtb3 113
ELSE
xtb3 0
ENDIF

xTaskbarx $xTaskbarOffset+xtb1+xtb2+xtb3$