Hierarchy / Chained Chat

A specialized voice channel that can be structured so that those inside can only hear chat from users directly above and beneath (above taking priority) them in the chain. Similar to military communications, and would be used for large-scale collaboration. Role A would be chat leader and could communicate with other As and role Bs. Role Bs could communicate with As, Bs, and Cs. Cs with Bs, Cs, and Ds... ad infinitum. Essentially large chat organized, without noise pollution. Alternative to using roles could be branching sub-channels.