46mkz5j02 wrote: > Run the vcr audio through a low-pass filter before sending it to the input of the sound card.
Thank you very much. I don't know how to set up an analog low-pass filter, but I tried software filtering the digitalized track and the whistle disappeared. I was afraid that that would also cut the higher harmonics and distort the sound, but as far as my ear goes, that doesn't seem to happen. For those who might run into the same problem, I used this command: sox original-track.wav filtered-track.wav filter -2200 2200 is the cutoff frequency of the low-pass filter, I tried several values and that was the highest one that actually removed the whistle from my track; your mileage may vary. According to the man page, sox has two other low-pass filter effects with different damping curves: "lowp" and "lowpass". I tried those too, but at 2200 the whistle was still there, so I gave up. Gerardo
