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Many Tnx But for beginning i'm looking also for simple physical formulas for gain calculation . Is it RMS Gain (%) = sqrt ( sum 1..n ( sample[i]^2 ) ) / MAX_SINE_RMS or Gain (%) = sum 1..n abs( sample[i] ) / MAX_SINE_AREA or something else sorre im newbie in sound/DSP programing Tnx in advance Ralfs K --- This message contains no viruses. Guaranteed by Kaspersky Anti-Virus. www.antivirus.lv