MVV is an online MIDI input visualizer, recorder and player, created for piano learners.

It visualizes:

• Note events (which keys are pressed), with intencity (aka velocity)
• Pedal depth (sosutenuto pedelanot supported yet)

(Click image to open MVV)

• 1 or F1: Hide screen
• 2 or F2: Freeze roll pane
• F or double tap anywhere : Toggle full-screen
• R: Record start/stop
• SPACE: Playback start / pause
  • Left/Right: during playback -- Rewind/Fast-forward
• Z: Stop playback
• S: Save the last recording as a midi file
• L: Load a *.mid file
• 3: Show FPS and playback timer resolution.

• Only note ons/offs and the pedal depth will be visualized.
• Other MIDI events are not visualized, but MVV will/should still record / play them; not tested though.

• P4: Re-architect the entire thing
• P1: Always recording mode
  • Estimate RAM consumption
  • Throttle control changes if needed.
  • Auto-detect between pieces
• P3: Better playback (as a geneal MIDI player)
  • Fast-forward should send all skipped control changes
  • Rewind should replay all control changes
• P4: Actually sync the renderer to vsync (how?)
• P4: Support SMPTE time format in *.mid files
• P4: Add help (not important now that we have buttons)
• P3: Visualize sosutenuto pedal depth
• P1: On-screen playback/recording controls
  • Play/Record/Stop/Pause/RewindToTop
  • FF/Rewind -> not needed, now that we have the position bar
  • Video mute
  • Pane freeze
  • Current position
• Show confirmation dialog before over-recording or loading
• Prevent text selection
• Support pausing
• Keep playing while in the BG too
• Don't use prompt() (which stops playback)
• Support loading a *.mid file
  • Support self-created mid files
  • Support other mid files
• Constant scroll speed regardless of FPS
  • It should be mostly fixed with double-buffering now, as long as updating the hidden buffer finishes within 16 ms.
• Show playback timestamp