Most contemporary audio recording is done with Digital Audio Workstations (DAWs), although digital mixing systems in the form of outboard digital mixers are also very popular. To the user, these digital systems appear similar to traditional audio tools and are designed order to emulate the operation of a conventional analog recording system.One familiar analog tool that has been carried over to the digital realm is a “peak meter” that tells the amplitude of the waveform’s peaks. In the analog realm, peak signal was an indicator that would alert the audio engineer when the peak signal level was getting too high. A peak signal in analog recording would cause the tape to saturate, creating distortion. In an analog system however, this type of distortion was often deliberately engineered into tracks in order to achieve a certain sound.In the digital realm this type of meter is important and more vital, because if the amplitude of a waveform exceeds the top of the measurable scale (full scale, or “full code”), the signal will “clip” causing unwanted and unpleasant distortion rather than the traditional distorted sound of analog. This digital clipping occurs because the waveform is “lopped off” and the data is changed. When the waveform is reconstructed it cannot be accurately done in order to represent the original waveform. Instead, it has a significant amount of inharmonic distortion caused by aliasing. For this reason, digital recording has a maximum level at which signals can be recorded. Anything exceeding this level (full scale) has undesirable consequences.The method used for computing the peak value inside the system however is not particularly accurate. DAW systems typically take the amplitude of the samples and use these as the basis for the peak meter. The problem with this approach is easily identified: the samples themselves do not represent the peak value of the waveform. The waveform is only complete after the reconstruction process. Until this process has been completed, the waveform is inaccurately represented by the samples. This is the reason that in most DAWs the waveform is represented on the screen as a “dot to dot” connection between sample points. They do not undergo the reconstruction process inside the system, so all that can be represented is the sample points and for the sake of visual ease, they connect the dots between them with straight lines. They save the reconstruction process for the digital to analog converters.The consequence of the way in which DAWs treat waveforms is that the meter inside the DAW or other digital mixers inevitably shows inaccurate information. It is virtually a mathematical certainty that the waveform will exceed the amplitude of the samples in any sampling system. The samples themselves only represent a waveform. It is important to understand that the amplitude of the waveform will invariably exceed the sample values.