Abstract: Hereinafter disclosed is methodology and apparatus for converting wide dynamic amplitude range digital data recorded in floating point digital word form, comprising a binary coded mantissa and a binary coded exponent, to an analog signal, or oscillogram, of selectively compressed and/or amplified dynamic amplitude range. The digital word, occupying a number of binary bit positions, is, in algebraic form, .+-.AG.sup.E ; where A represents the mantissa, or argument, G represents the base, or radix, of the number system used and E represents the exponent. Since the base G is constant, for example at 8, the only binary bits that need to be recorded are those representing the mantissa A and the exponent E. In reconverting the digital data to analog form for making an oscillogram, or wiggle trace, it is desired to selectively amplify and/or compress the dynamic range and, yet, at the same time avoid introducing serious distortion.