Load the prerecorded synthetic voice sample into your digital audio workstation. If you do not own a DAW, programs such as Logic, ProTools and Record provide all of the necessary tools for thorough audio editing and effects processing. If you do not wish to purchase a DAW, freeware programs such as Reaper and Audacity include many similar features to their retail counterparts. If you prefer to avoid software production packages entirely, you will need to purchase hardware models of the effects you wish to incorporate into your recording. Popular audio equipment retailers such as Guitar Center, Sam Ash and Musician's Friend sell a variety of hardware tools for audio producers.
Change the equalization, or texture, of your synthetic voices using a graphic equalizer. If you are using one of the aforementioned DAWs, select the graphic equalizer tools from the list of installed effects processors. Graphic equalizers typically incorporate adjustable high, mid and low frequency settings. If your recording contains excessive bass levels, reduce the low frequency setting on the equalizer. Diminish the presence of harsh, abrasive, high-pitched sounds in your recording by lowering the high frequency setting. Conversely, increasing this parameter will add a shiny, vibrant quality to dull or muted recordings.
Change the pitch of your synthetic voices using a pitch shifter or pitch corrector. Minor discrepancies in intonation can often be remedied using the pitch corrector, while the pitch shifter is capable of adjusting recorded audio by semitones and larger intervals. Each of the previously mentioned DAWs incorporates tools designed for pitch adjustment. Many hardware devices also perform similar functions.
Create a rough, distorted finish on your vocal tracks using effects processors such as the bit crusher, amp modeler or overdrive. Each of these effects modifies the original track either through the addition of distorted, "muddy" tones or by removing individual "bits" of the recording and reducing the overall clarity. Many popular music producers use distortion utilities on vocal as well as instrumental tracks.
Create an artificial reverberation in your vocal track using the synthetic "reverb" utilities in your DAW or hardware device. The dampening foam prevalent in many recording studios is designed to remove any unwanted atmospheric noise in a recording project. Producers often utilize reverb utilities in order to produce an "authentic" feel for their vocal recordings.