Code:
alias syn {
  if (%mp3.dir == $null) { set %mp3.dir $sdir(C:/,Select Your mp3 Directory) }
  if (%rand == on) { set $rand(%mp3.dir) | syn.dis | syn.play [color:Red]{[/color]
  if ($insong == true) { on *:mp3end: { set %mp3 $rand(%mp3.dir) | syn.dis | syn.play } } 
  ...


Red portion needs to be flipped. >:D

Code:
...
[color:Red]alias[/color] syn.play {
...


and finally..
Code:
... $rand(%mp3.dir) ...

should be
Code:
$findfile(%mp3.dir, *.mp3, $rand(1, $findfile(%mp3.dir, *.mp3, 0)))

-KingTomato