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Explanation: depuración = depuration, purification, cleaning, scrubbing. (Collazo)
I feel that none of these fits the context. One of the meanings that Louis Robb gives for depurador is filter. So I think I am right.
Robert INGLEDEW Argentina Local time: 02:57 Native speaker of: English, Spanish PRO pts in pair: 1940
Explanation: I tend to agree with Robert, this is just another possibility - when you have a track or an instrument in a digitalizer's memory and you want to get rid of it.
The other possibility (not really a filtering, but a treatment of tracks or known as "digital mastering") involves moving the extremely high and extremely low notes on a digital sound graph so as to avoid vibrations in the audio signal.
Parrot Spain Local time: 06:57 Native speaker of: English PRO pts in pair: 7645