--- a/aufile.c
+++ b/aufile.c
@@ -217,8 +217,7 @@
 audio_open(int samp_rate,int disp)
 {
  int i;
-// esd_fd = open(dev_file, O_WRONLY | O_NDELAY);
- esd_fd = open(audio_dsp, O_WRONLY);
+ esd_fd = open(audio_dsp, O_WRONLY | O_NDELAY);
  if (esd_fd < 0)
   {
    if (disp) perror(audio_dsp);