预期行为:中央C在一台MIDI乐器上演奏，然后在另一台上演奏。实际行为:DL弃用警告并且没有声音。运行Windows7。代码:require"dl/import"classLiveMIDION=0x90OFF=0x80PC=0xc0definitializeopenenddefnote_on(channel,note,velocity=64)message(ON|channel,note,velocity)enddefnote_off(channel,note,velocity=64)message(OFF|channel,note,velocity)enddefprogram_cha