Sorry. Now it should work.
v1:
$loop(%_path%)$num(%track%,2). $left(%artist% - %title%,60) $repeat( ,$sub(60,$len($left(%artist% - %title%,60))))%_length%
$mid(%artist% - %title%,61,60) $repeat( ,$sub(60,$len($mid(%artist% - %title%,61,60))))
$loopend()
v2 (No empty lines):
$loop(%_path%)$num(%track%,2). $iflonger(%artist% - %title%,60,$left(%artist% - %title%,60) $repeat( ,$sub(60,$len($left(%artist% - %title%,60))))%_length%
$mid(%artist% - %title%,61,60) $repeat( ,$sub(60,$len($mid(%artist% - %title%,61,60)))),$left(%artist% - %title%,60) $repeat( ,$sub(60,$len($left(%artist% - %title%,60))))%_length%)
$loopend()