How to access ”tied” property of note?

Now I'm rewriting the shakuhachi notation plugin for the ver.2.
The notation doesn't need at the note to tied to previous note ( to avoid duplication ), so I want to check the tied property.

console.log(notes[0].pitch)
console.log(notes[0].tpc)
console.log(notes[0].color)
works well.
But
console.log(notes[0].tied)
returns
Debug: indefined

Please tells me the usage of tied properties.

In addition,
console.log(note[0].noteHead)
returns
Debug: indefined

console.log(note[0].name)
returns
function() { [code] }