Chou Collection, Upper Volume
Radical: Mouth (kǒu)
Character: ling
Kangxi stroke count: 8
Page 181, Entry 29
Guangyun (Expanded Rhymes) and Jiyun (Combined Rhymes) state it is pronounced ling.
Yupian (Jade Chapters) defines it as the sound of someone whispering or muttering.
Additionally, Guangyun (Expanded Rhymes) cites Cang Yun, which describes lingling as the act of speaking.