static Pair<TargetDataLine, SourceDataLine> javaSound_bothLines(S mixerName, AudioFormat format, int internalBufferSize) ctex {
  Mixer	mixer = mixerName == null ? null : AudioSystem.getMixer(javaSound_getMixerInfo(mixerName));
  DataLine.Info	targetInfo = new DataLine.Info(TargetDataLine.class, format, internalBufferSize);
  DataLine.Info	sourceInfo = new DataLine.Info(SourceDataLine.class, format, internalBufferSize);
  TargetDataLine in;
  SourceDataLine out;
  if (mixer != null) {
  	in = (TargetDataLine) mixer.getLine(targetInfo);
  	out = (SourceDataLine) mixer.getLine(sourceInfo);
  } else {
  	in = (TargetDataLine) AudioSystem.getLine(targetInfo);
  	out = (SourceDataLine) AudioSystem.getLine(sourceInfo);
  }
  in.open(format, internalBufferSize);
  out.open(format, internalBufferSize);
  ret pair(in, out);
}