Matlab Midi发送消息问题，不听输出

Question

我试图让MATLAB将MIDI消息发送到我的键盘，但我什么都没听到。我可以使用MIDRECEIVE收到MATLAB。这是代码...

mididevinfo;
%   MIDI devices available:
%   ID  Direction  Interface   Name
%    0    input    CoreMIDI   'USB Keystation 88es'
%    1   output    CoreMIDI   'USB Keystation 88es'

device = mididevice('USB Keystation 88es');

msgs = midimsg('Note',1,48,64,0.25);
midisend(device,msgs);