{ name
, run ? null
, connectOut ? null
, connectIn ? null
, group ? null
, initial ? null
, trivmix
, stdenv
, makeWrapper
, jack2Full
, coreutils
, writeScript
}:

let
  connect = (! isNull connectOut) || (! isNull connectIn);
  connectScript = writeScript "connect" ''
    #!${stdenv.shell}

    PATH=${jack2Full}/bin:$PATH

    ${optionalString (! isNull connectIn) "jack_connect ${connectIn} $1"}
    ${optionalString (! isNull connectOut) "jack_connect $2 ${connectOut}"}
  '';
  inherit (stdenv.lib) optionalString;
in {
  out = {
    wantedBy = [ "sound.target" ];
    requires = [ "jack.service" ];
    before = [ "mpd.service" ];
    serviceConfig = {
      Type = "simple";
      ExecStart = ''${trivmix}/bin/trivmix --client ${name} \
        ${optionalString connect "--run ${connectScript}"} \
        ${optionalString (! isNull run) "--run ${run}"} \
        ${optionalString (! isNull initial) "--level ${initial}"} \
        /dev/shm/mix/${name}/level \
        ${optionalString (! isNull group) "/dev/shm/mix/${group}/level"}
      '';
      User = "jack";
      Group = "audio";
      Nice = "-10";
      LimitRTPRIO = "95:95";
      LimitMEMLOCK = "infinity";
    };
  };
}