The Mixer family of opcodes provides a global mixer for Csound. The Mixer opcodes include MixerSend for sending (that is, mixing in) an arate signal from any instrument to a channel of a mixer buss, MixerReceive for receiving an arate signal from a channel of any mixer buss in any instrument, MixerSetLevel (krate) and MixerSetLevel_i (irate) for controlling the level of the signal sent from a particular send to a particular buss, MixerGetLevel for reading (at krate) the level for sending a signal from a particular send to a particular buss, and MixerClear for resetting the busses to zero before the next kperiod of a performance.