In Firefox the envelope release is broken, and overall performance seems worse compared to Chrome, for reasons I haven't really bothered to investigate deeply.

In Firefox the envelope release is broken, and overall performance seems worse compared to Chrome, for reasons I haven't really bothered to investigate deeply. It mostly works in Safari, but Safari does something different with garbage collection of audio nodes, so the note-stealing behavior doesn't work right. Basically, use Chrome for now if you want it to play nice. WebMIDI is only supported in Chrome anyhow. Also, 100% agreed on TAL U-NO-LX, it's one of my favorite plug-ins and the price is great!