왜 이곳서는 똑같은 태그인데도 music bar가 opaque하게
안 나타나는지 모르겠네요(제 컴퓨터 모니터에는)

Sorry for being late in answering.
Your original "finishopacity" was "0" in the player controls.
Here, I changed it to "40" as the original was too dark-appearing.

Also, I removed the "progress bar" at the top as it looked too thick in muliple players
by changing the height from "45" to "25".

Your original was wonderful. Just a personal preference.

거사님, 제가 그만 music bar(player controls) "finishopacity"를 40으로 변경시키신 걸 못 봤군요 !!

얼마전 공연히? Windows Media Player를 #10에서 #11Version으로
upgrade한 후론 music bar 색갈들이 완전히 검은색으로 너무 뚜렷이 나타나기에 (제 컴퓨터 화면엔),
밤을 나타내는 deep blue color와 잘 blend 되게하기 위해서 "finishopacity"를 0 로 했지요.