Hi, I trying to use this UAna's: adc => AutoCorr autoCorr => blackhole; adc => FFT fft =^ RMS rms => blackhole; adc => LPF lowPassFilter => blackhole; fft =^ RollOff rolloff => blackhole; fft =^ Centroid centroid => blackhole; fft =^ Flux flux => blackhole; fft =^ ZeroX zerox => blackhole; fft =^ XCorr xCorr => blackhole; but xCorr.upchuck() @=> blobxCorr; blobxCorr.fval(0) => correlacionCruzadaInst; <<< correlacionCruzadaInst>>>; autoCorr.upchuck() @=> blobAutocorrelacion; blobAutocorrelacion.fval(0) => autocorrelacionInst; <<< autocorrelacionInst>>>; I always gets 0 values of autocrrelation and CrossCorrelation. anybody know the reason??? Thanks. -- Fernando Alonso Martín Lualobus@gmail.com http://roboticnaturalinteraction.comhttp://www.roboticNaturalInteraction.com/famartin.html