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Procedure UpdateWaveImage(PBImage, *SampleData.Sample, SampleCount)
  
  Protected LastL, CurrentL, LastR, CurrentR
  
  If *SampleData And SampleCount
    StartDrawing(ImageOutput(PBImage))
    Width = OutputWidth() : Height = OutputHeight()
    If chans = 1
      VOffsetL = Height >> 1
    Else
      VOffsetL = Height >> 2 : VOffsetR = VOffsetL + Height >> 1
    EndIf   
    Mul = (VOffsetL * $19999) >> wavey
    If chans = 1
      Mul = (VOffsetL * $19999) >> wavey
    EndIf
    Box(0, 0, Width, Height, $0000FF)   
    Line(0, VOffsetL, Width, 1, wavecolor)
    If chans = 2
      Line(0, VOffsetR, Width, 1, wavecolor)
    EndIf
    SamplesPerPixel = (SampleCount + Width - 1) / Width
    MinL = $7fff : MaxL = $8000 : MinR = $7fff : MaxR = $8000
    MinL_ = $8000 : MaxL_ = $7fff : MinR_ = $8000 : MaxR_ = $7fff
    x = - 2
    While SampleCount
      If *SampleData\l < MinL
        MinL = *SampleData\l
        CurrentL = MinL
      ElseIf *SampleData\l > MaxL
        MaxL = *SampleData\l
        CurrentL = MaxL
      EndIf
      If chans = 2
        If *SampleData\r < MinR
          MinR = *SampleData\r
          CurrentR = MinR
        ElseIf *SampleData\r > MaxR
          MaxR = *SampleData\r
          CurrentR = MaxR
        EndIf
      EndIf
      *SampleData + 4
      Sample + 1 : SampleCount - 1
      If Sample = SamplesPerPixel Or SampleCount = 0
        MinL = (MinL * Mul) >> 16 : MaxL = (MaxL * Mul) >> 16
        ;LineXY(X, VOffsetL - MinL, X, VOffsetL - MaxL, wavecolor)
        
        CurrentL = (CurrentL * Mul) >> 16
        LineXY(X, VOffsetL - LastL, X, VOffsetL - CurrentL, wavecolor)
        LastL = CurrentL
        
        If chans = 2
          MinR = (MinR * Mul) >> 16 : MaxR = (MaxR * Mul) >> 16
          ;LineXY(X, VOffsetR - MinR, X, VOffsetR - MaxR, wavecolor)
          
          CurrentR = (CurrentR * Mul) >> 16
          LineXY(X, VOffsetR - LastR, X, VOffsetR - CurrentR, wavecolor)
          LastR = CurrentR
          
        EndIf
        X + wavex : Sample = 0
      EndIf
    Wend
    StopDrawing()
  EndIf
EndProcedure