Here (point G in the studio outline) we find all the different kinds of effects, signal processors [Effects and signal processors ] and various modules necessary for musical production. The kind of modules available in a studio depend on the choices one makes and one's financial resources. However, there are certain modules that are pretty indispensable, even for a startup recording studio. With time, the rack can be enriched and improved as new modules are added. The modules' quality depends on the care and craftsmanship with which they are created, which is usually proportional to their price and this reflects a pretty universal truth concerning price/quality. Naturally the market is full of exceptions to this rule, with poor quality modules being sometimes sold at exorbitant prices, and vice versa, quite affordable modules that do an honest job and fulfil the function they were designed for. In these matters, knowledge and experience are very important to get as much as possible out of one's budget. The limit between what is necessary and what is superfluous is very subjective, so let's not get philosophical and let's stick to simply pointing out at least a couple of compressors [Compressor ] and a good reverb unit [Reverb ] for your fancy studio.