I got it to work, changed mixer according to this;
Changing Mixer Type
MuBox by defaults set mixer_type to "hardware". MPD supports 3 types of mixers. See below for description. For best sound quality, set mixer_type to "disabled". Setting to "software" is not recommended unless it is really necessary to control volume for your use, e.g. listen via headphone/earphone, and your DAC does not have hardware volume mixer built-in.
# Volume control mixer ########################################################
#
# These are the global volume control settings. By default, this setting will
# be detected to the available audio output device, with preference going to
# hardware mixing. Hardware and software mixers for individual audio_output
# sections cannot yet be mixed.
#
# An example for controlling an ALSA, OSS or Pulseaudio mixer; If this
# setting is used other sound applications will be affected by the volume
# being controlled by MPD.
#
#mixer_type "hardware"
#
# An example for controlling all mixers through software. This will control
# all controls, even if the mixer is not supported by the device and will not
# affect any other sound producing applications.
#
#mixer_type "software"
#
# This example will not allow MPD to touch the mixer at all and will disable
# all volume controls.
#
#mixer_type "disabled"
#
###############################################################################
Have not yet tested how it impacts on the sound quality though.....
best regards Lars
