I know there is a way to edit this property in the notes, but this could be more graphic for ease and convenience, as in MUTA, the TMG parameter does this and it is easier and easier where such a syllable starts and where it ends. I hope to understand since my English is very bad and use Google Translate for this.
「いいね！」 3
If you use phonemes, you’ll have the same result?
Juste cut the note in multiple and add phoneme.
Look this video 
「いいね！」 2