How can a Multi Channel Audio be played by an Audio Device with ASIO using MATLAB

The Multi Channel Audio is written in a matrics, with 4 column representing 4 audio channels.

The Audio Device has more than 4 channels.

In Matlab, both dsp.AudioPlayer and To Audio Device Block in Simulink can be used, but only two channels are activated.

How can all 4 channel audio files be played in MATLAB?

The codes by using dsp.AudioPlayer are as follows:

clear;clc;

H = dsp.AudioPlayer;%creating the To Audio Device

H.DeviceName='扬声器 (RME Hammerfall DSP MADI)';% this is the multi channel audio device.

H.SampleRate=44100;

H.DeviceDataType='32-bit float';

H.BufferSizeSource='Auto';

H.QueueDuration=2;

H.ChannelMappingSource='Property';

H.ChannelMapping=1:4;

load test4Channel.mat %this is the audio matrix with sampling rate 44100, time length 45s, 4 columns.

for i=1:45;

step(H,Data((i-1)*44100+1:i*44100,:));%try to play 4 channel audio, but only 2 channels worked.

end

Many Thanks!!