WaveFile wave2 = SpectrumAnalyzer.readWaveFile(input2);
if (wave2 != null) {
short[] fileData1 = SharedDSPFunctions.extractWaveFileData(wave1);
short[] fileData2 = SharedDSPFunctions.extractWaveFileData(wave2);
MixerMode mode;
if (radioAvg.isSelected()) {
mode = MixerMode.AVERAGE;
} else {
mode = MixerMode.SUM;
}