1.3 About the ModelingMany different elements contribute to the unique sonic characteristics of analog gear such as theFairchild 670. Waves painstakingly modeled and incorporated these elements into the PuigChild inorder to fully capture and replicate the sound and performance of the original equipment.These are some of the most important elements of analog behavior:• Total Harmonic DistortionPerhaps the most important analog behavior is Total Harmonic Distortion or THD, which is definedas the ratio of the sum of the powers of all harmonic components to the power of the fundamentalfrequency. THD is usually caused by amplification, and changes signal shape and content byadding odd and even harmonics of the fundamental frequencies, which can change the overall tonalbalance. THD can also change peak output gain, usually by no more than +/- 0.2-0.3 dB.• TransformersSome hardware uses transformers to stabilize or change Input/Output loads and signal levels. Inearlier days, transformers did not have a flat frequency response, and often introduced low andsuper-high frequency roll offs. The original Fairchild has four transformers, so if you encounter a lowor extremely high frequency loss, this is due to the modeled transformers.• Long Release TimesThe Fairchild includes settings which use long time constants of several seconds. This might causeshort looped passages to sound different during successive playbacks, because the Release neverreturns to unity. This is identical to the original hardware performance, and should not be a causefor concern.• HumWaves modeled both 50Hz power current and 60Hz power current. If you listen closely, you willhear that there is a difference in hum level between 50Hz and 60Hz. Since hum is unique to eachregion and dependent upon the local electrical conditions, you may find that the modeled hum isdifferent than the hum already present in your studio, and may not be suitable for your particularuse.1.4 ComponentsWaveShell technology enables us to split Waves processors into smaller plug-ins, which we callcomponents. Having a choice of components for a particular processor gives you the flexibility tochoose the configuration best suited to your material.The PuigChild has two component processors:PuigChild User Manual5