opcode FltClassic, 0, iKKK
  iRoll, kFreq, kRes, kMod xin
  ain zar 2; CHANGE
  kmod zkr 1; CHANGE
  kPitch zkr 2; CHANGE
  aout lowresx ain, kFreq+kmod*kMod+kPitch, kRes, iRoll ;Roll = 2,3,4 x6
  ; balance ???
  ; Freq is not in Hz for lowresx
  zaw aout, 2 ;CHANGE
endop
