It loops!

[natevw]

Release early, release often — right?

I have something that works just well enough to file bugs on. It roughly follows the architecture outline of #1 (comment).

It has the following known issues:

• interface is half baked, doesn't even show record status
• queuing up of notes — and cancellation thereof — is very coarse grained [whole loop at a time]
• no handling of half-fired notes [records ± raw MIDI messages, which means if an "on" happens before you press record, or an "off" happens after you stop…]
• occasionally misfires random notes while recording [think I realized what this one was already]

and missing features:

• no overdub, undo/redo or even a good way to stop/resume
• only sends to simple softsynth, needs a MIDI out dropdown
• option to disable "local echo" (i.e. avoid forwarding live input to output)
• ability to filter what sort of messages and/or which channel numbers are recorded

But here's how you use it:

1. Open the index.html file in Chrome
2. Connect a MIDI keyboard controller, or select from those already connected
3. Press "space" or click button — recording starts, invisibly
4. Play some notes
5. Press "space" or click button — playback starts

To stop playback right now, either press space twice to store an empty loop or refresh the page.