Type alias LoudnessChannel

LoudnessChannel: "L" | "R" | "C" | "Ls" | "Rs" | "LFE"

BS.1770-5 channel labels for the 3/2 (≤5 main channel) configuration of Annex 1. LFE is accepted but EXCLUDED from the loudness sum per the recommendation (Annex 1, Fig.1 / Table 3, p.3,7).