Triads, Lyrics, Multiple Instruments, and some bugs I noted

Good afternoon,

Thank you for creating this wonderful service. I use it for hours a day to practice singing with a guitar.

The features I would most like to see added are:

1. Multiple instrument display. Being able to see guitar and piano chords in the same seqeunce would be wonderful for working together,

2. Lyrics can be overlaid on top of the guitar track, it would be difficult to implement because most online sources format the lyrics by showing the chorus only once, and not in order of how many times it gets repeated. Maybe allow users to manually edit this feature for each song to help place lyrics in the right spot.

3. Displaying triads and scales on top of each chord shape. This is specifically for soloing/improvising over the chord progression.

Now only to the issues I've noticed.

1. When restarting the track after it has already been partially played once, the first chord is not being displayed correctly

2. The volume, tempo, and other sliders do not disappear when clicking the play button.

3. Tempo change doesn't seem to work for any videos

4. A lot of music on youtube is stored as entire albums, would be great to increase time limit for videos to allow full length albums to be transcribed

Thank you