HDSP_Midi0InterruptEnable
hmidi->hdsp->control_register |= HDSP_Midi0InterruptEnable;
ie = hmidi->id ? HDSP_Midi1InterruptEnable : HDSP_Midi0InterruptEnable;
hdsp->control_register &= ~HDSP_Midi0InterruptEnable;
hdsp->control_register &= ~(HDSP_Start|HDSP_AudioInterruptEnable|HDSP_Midi0InterruptEnable|HDSP_Midi1InterruptEnable);