[dutchflyboy]

Looks great! The only thing that bugged me was the position indicator, as it didn't have a very predictable motion. Sometimes it goes very fast, other times it just stops. I understand that it's impossible to make the speed constant, but at the moment it really doesn't look natural.

[dangrover]

It goes at the speed of the music, depending on how long notes are held. I've been experimenting with that animation...it does seem kinda uncanny valley somehow

[mcav]

I noticed that too. I'm not sure if there's a better way to do it or not; as a piano player myself, it might seem more intuitive to me to have a visual indicator at each beat in the measure, and then just highlight each note (via color or something) as it's played. I think the reason it seems off is because it's so irregular, even though it does match with the music itself.

Kudos though, Etude looks great.

[manvsmachine]

I'd suggest a combination of both mcav and cpr's suggestions. Highlight the notes themselves instead of the area around them. Drop the jumpy marker and replace it with a smoothly moving, constant speed vertical marker. It's a commonly recognized and understood element (used in pretty much any and every audio production / recording software). It also gives the viewer a better sense of the tempo. Remember, tempo can change drastically over the course of a song; the current marker doesn't demonstrate the difference between playing shorter notes at a slower tempo and longer notes at a faster tempo.

[Entlin]

I agree, combining note highlighting and smooth moving marker would seem to be the best way to go.

It's probably best if the moving marker is a 1-inch-wide bar that is very subdued. In my head at least, this would work best.

[cpr]

Maybe have a constant-speed thin vertical cursor along with (behind) the jerky highlight? That would help to smooth things out and get out of the "valley."

[jcdreads]

Or you could just highlight the current bar.