TDN.134:7 :ܒܩܝ݂ܢܬܐ ܫܘܝ݂ܬܐ ܐܟܚܕܐ ܒܫܘܝܘ݂ܬ ܒܪܬ ܩܠܐ ܢܥܢܐ ܟ݁ܠܗ ܥܡܐ‏ : the entire congregation shall respond with an coordinated song in unison
See the entire entry for šawyū, šawyūṯā n.f. equality; equanimity