Error replies echo osc/xid too; read-only fields on LOCAL answer 405
Note that device/system reads empty on all four units
Add measured filter shapes, crossover, delay and the request limit
Add the write-tested mute persist and input mix
Add the Neumann KH SSC Reference Protocol, paths, device behaviour, EQ, identity and limits of Neumann KH DSP speakers, measured on KH 120 II and KH 750 hardware.