So I rewrote the glass progressbar completely using code, no images needed. I think I got pretty close, maybe someone else can tweak the gradient to make it closer:

// Progress Bar
$drawrect(10,10,$sub(%_width%,20),25,brushcolor-0-0-0 pencolor-null)
$ifgreater(%playback_time_seconds%,1,
$drawrect(10,10,$muldiv($muldiv(100,%playback_time_seconds%,%length_seconds%),$sub(%_width%,20),100),25,brushcolor-110-170-170 pencolor-null)
,)
// Gradient
$drawrect(10,10,$sub(%_width%,20),4,brushcolor-0-0-0)
$drawrect(10,13,$sub(%_width%,20),1,pencolor-0-0-0 alpha-255)
$drawrect(10,14,$sub(%_width%,20),1,pencolor-0-0-0 alpha-240)
$drawrect(10,15,$sub(%_width%,20),1,pencolor-0-0-0 alpha-225)
$drawrect(10,16,$sub(%_width%,20),1,pencolor-0-0-0 alpha-210)
$drawrect(10,17,$sub(%_width%,20),1,pencolor-0-0-0 alpha-195)
$drawrect(10,18,$sub(%_width%,20),1,pencolor-0-0-0 alpha-180)
$drawrect(10,19,$sub(%_width%,20),1,pencolor-0-0-0 alpha-165)
$drawrect(10,20,$sub(%_width%,20),1,pencolor-0-0-0 alpha-150)
$drawrect(10,21,$sub(%_width%,20),1,pencolor-0-0-0 alpha-135)
$drawrect(10,22,$sub(%_width%,20),1,pencolor-0-0-0 alpha-120)
$drawrect(10,23,$sub(%_width%,20),1,pencolor-0-0-0 alpha-105)
$drawrect(10,24,$sub(%_width%,20),1,pencolor-0-0-0 alpha-90)
$drawrect(10,25,$sub(%_width%,20),1,pencolor-0-0-0 alpha-75)
$drawrect(10,26,$sub(%_width%,20),1,pencolor-0-0-0 alpha-60)
$drawrect(10,27,$sub(%_width%,20),1,pencolor-0-0-0 alpha-45)
$drawrect(10,28,$sub(%_width%,20),1,pencolor-0-0-0 alpha-30)
$drawrect(10,29,$sub(%_width%,20),1,pencolor-0-0-0 alpha-15)
$drawrect(10,30,$sub(%_width%,20),1,pencolor-0-0-0 alpha-1)
$drawrect(10,10,$sub(%_width%,20),2,pencolor-233-233-233 alpha-210)
$drawrect(10,12,$sub(%_width%,20),2,pencolor-233-233-233 alpha-180)
$drawrect(10,14,$sub(%_width%,20),2,pencolor-233-233-233 alpha-150)
$drawrect(10,16,$sub(%_width%,20),2,pencolor-233-233-233 alpha-120)
$drawrect(10,18,$sub(%_width%,20),2,pencolor-233-233-233 alpha-90)
$drawrect(10,20,$sub(%_width%,20),2,pencolor-233-233-233 alpha-60)
$drawrect(10,22,$sub(%_width%,20),2,pencolor-233-233-233 alpha-30)
// Frame
$puts(divider.pos,12)
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$sub(%_width%,13))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$drawrect(10,10,$sub(%_width%,20),25,brushcolor-null pencolor-174-174-174)
$drawrect(11,10,$sub(%_width%,22),25,brushcolor-null pencolor-0-0-0)
$drawrect(10,11,$sub(%_width%,20),23,brushcolor-null pencolor-0-0-0)
// Dividers
$puts(divider.pos,$muldiv(1,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$muldiv(2,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$muldiv(3,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$muldiv(4,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$muldiv(5,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$muldiv(6,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$muldiv(7,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$muldiv(8,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)
$puts(divider.pos,$muldiv(9,$sub(%_width%,10),10))
$drawrect($sub($get(divider.pos),1),12,1,22,pencolor-0-0-0)$drawrect($sub($get(divider.pos),1),12,1,15,pencolor-60-59-59)$drawrect($sub($get(divider.pos),1),12,1,6,pencolor-64-63-63)$drawrect($sub($get(divider.pos),1),12,1,5,pencolor-74-73-73)$drawrect($sub($get(divider.pos),1),12,1,4,pencolor-88-87-87)$drawrect($sub($get(divider.pos),1),12,1,3,pencolor-107-106-106)$drawrect($sub($get(divider.pos),1),12,1,2,pencolor-124-124-124)$drawrect($sub($get(divider.pos),1),12,1,1,pencolor-133-133-133)
$drawrect($get(divider.pos),12,1,22,pencolor-1-179-186)$drawrect($get(divider.pos),12,1,21,pencolor-2-191-199)$drawrect($get(divider.pos),12,1,20,pencolor-2-211-219)$drawrect($get(divider.pos),12,1,19,pencolor-2-228-237)$drawrect($get(divider.pos),12,1,18,pencolor-2-238-248)$drawrect($get(divider.pos),12,1,17,pencolor-124-249-254)
$drawrect($add($get(divider.pos),1),13,1,22,pencolor-0-0-0)$drawrect($add($get(divider.pos),1),13,1,14,pencolor-60-59-59)