CC Ādi 11.16

rāmadāsa — mukhya-śākhā, sakhya-prema-rāśi
ṣolasāṅgera kāṣṭha yei tuli’ kaila vaṁśī
Word for word: 
rāma-dāsa — Rāmadāsa; mukhya-śākhā — chief branch; sakhya-prema-rāśi — full of fraternal love; ṣolasa-aṅgera — of sixteen knots; kāṣṭha — wood; yei — that; tuli’ — raising; kaila — made; vāṁśī — flute.
Translation: 
Rāmadāsa, one of the chief branches, was full of fraternal love of Godhead. He made a flute from a stick with sixteen knots.