Radio terminal equipment of a communication system, the communication
system comprising one or more secondary units coupled to the radio
terminal equipment, the radio terminal equipment comprising: means for
receiving information on audio characteristics optimising an audio signal
of the secondary unit, means for converting the audio characteristics
information into a form of an audio control algorithm used in the radio
terminal equipment for performing a secondary unit audio control
algorithm, means for optimising an audio signal of the secondary unit by
using the secondary unit audio control algorithm.