You can see the form of 'Renshō' in this ancient document.

His voice is very attractive.

He was showered with jeers.

He underwent vocal cord surgery.

He practices vocalization every day.

He practices every day to pronounce accurately.

His prestige increased due to his achievements.

Pictophonetic characters are characters that express sound and meaning at the same time.

He needed to fully control his vocal register to sing that song.

This book explains in detail how to use the 'Kyūjitai form of 声門' in old Japanese.