The engineering role will probably be the most familiar to regular SOS readers, and the issues of technical quality for digital audio in voiceover work are no different than they are for any other recording session. The key difference is that some clients will expect you to deliver 48kHz files instead of the 44.1kHz ones that are usually used in the music business. The 48kHz sample rate ensures that there's an integer number of audio samples for each frame of a standard 24 or 25 frames‑per‑second video recording.

You don't need a state-of-the-art production studio to work in voice-over. You do need good enough equipment to record, edit and submit a good audition. A computer with a microphone and a mixer may do the trick. It's important that the room you record in be as soundproof as possible – if you use a walk-in closet where the clothes muffle the sounds outside, the industry's not going to complain.
First of all, don’t be put off by the word technical. The ‘technical’ skills you need to learn to involve how you record and then edit your recording and of course you will need a home studio to do this. This needn’t be a daunting prospect though. Many freelance sound engineers are available who can help you with this – contact us if you want a reputable one.
You start off each job as a producer, consulting your client and getting briefed on the project at hand. Then you become an engineer, dealing with recording gear and software, setting the mic position and levels. Next, you step up to the mic as an actor, bringing the script off the page and connecting with the listener. Meanwhile, the director in you sits behind the metaphorical glass, making sure the actor doesn't mispronounce a word or stumble through a passage of text. Then you're an editor, cleaning up the best take and sending the resulting audio to your client. You need to be able to perform all of these roles to a high standard, and the better you are at each, the more your business will prosper.

"The editing process for all our titles starts with receiving the Pro Tools sessions or WAV files and the engineer's script, which has the markings of how many takes there were, and which ones the director liked best. In some cases, I use Strip Silence and add a bed of room tone to expedite the assembly edit. In others I'll add the room tone as I move through the audio. Once I had all the final takes to be used in [Favorite African Folk Tales], I went back to do a fine‑edit pass and created notes on any issues, such as misreads, mispronunciations, noises, and so on. With that list, I was able to discuss with Alfre how we would address the issues. Since the actors' schedules did not permit them to come back in to do pick‑ups I had to do some creative editing.”
I use the Adobe Audition package to edit my own voiceover work, but the techniques described below can be used in most audio‑editing software. Start by saving a new version of your original recording. (I keep the name of the file the same, but change the extension from _original to _edit.) Next, I'll turn my attention to the end of the recording, where I stepped away from the mic after the second take and recorded about 10 seconds of silence. Although processing is usually kept to a minimum, dealing with sibilance is important, and Eiosis' De‑esser plug‑in is much more precise than most.Wearing headphones, I can zoom in on this 'silence', turn up the volume, and listen for any background noise. If I notice any constant noise seeping into the recording, I may consider using Adobe Audition's noise‑reduction tool to capture a one‑ or two‑second profile of the silence, and then reduce the offending noise by about 75 percent throughout the recording. I should stress that this is rarely needed, and it's always a last resort, because such processing can generate swirly, metallic artifacts that draw more attention to themselves than the noise you intended to eliminate! But it's good to listen for such issues with fresh ears at the start of your editing session. If you find yourself using noise‑reduction often, that's a sign that you should find a better place to record, or improve the isolation of the space you've chosen. Don't forget that there are other ways to deal with some noise: often, a high‑pass filter is all you will need to clean up a recording, for example. Also remember that if your recording is to be mixed with music, slight background noise won't be noticeable, and that the more exposed your voice in the end product, the more problematic noise will become.
Your own voice is your most important piece of equipment. If you're new to the voice-acting world, look around to see if there are classes or coaching in your area. Outside of class, practice speaking clearly and confidently. Learn to do this even with material you've never seen before. It's also important to learn voice care – straining or injuring your voice can hurt you and your career.
Even if you're mixing yourself, it's better to add EQ and compression only when you can hear how it will sit with the soundtrack or special effects. Ultimately, it comes down to knowing what your voice will be used for and making a judgement. For instance, if I'm recording a tagline for a TV or radio advert, I'll generally run a mic into a nice preamp (where I might add slight tube warmth, and subtle EQ or compression, just to give the recording a bit of 'body'), and I may do a little de‑essing using a plug‑in when performing any edits. However, for e‑learning jobs, corporate videos and so on, I'll tend not to add any creative processing while recording or editing, and will only use the de‑esser ever so slightly.
1. You need to get oriented with the industry. You need an education in this business prior to investing in it—especially if you hope to be valuable as a voiceover talent. You need to understand who your core clients would be and who you would eventually create a voiceover demo for, namely, producers. If you’re not servicing them, then you’re not servicing your self. This is precisely why I wrote, “The SOUND ADVICE Encyclopedia of Voiceover & The Business of Being a Working Talent.” You need insight as to what’s needed and wanted of you in this field, and how professional sessions are run, otherwise you’ll likely frustrate yourself with unrealistic expectations.
Next, run these files through any standard EQ high‑pass and low‑pass filters you use, zoom in on the waveform, and select a one‑second strip of silence from each recording. Save these strips as separate files. For instance, on my system, a one‑second strip of silence recorded at 16‑bit, 44.1kHz on a Neumann TLM103 would have this name: room_tone_neumann_tlm_103_44100_16_one_second.wav. Ideally, the noise floor of each strip will be lower than ‑60dB. Now, when you have to remove a bump or a squeak between words, you can paste in a piece of these strips instead of muting, which would draw attention to the edit.
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Hey Rob. You certainly know your stuff. I know this for a fact, because I’ve been a working professional at this for nearly ten years and spend every week since that time making mistakes and learning from them. I also incorporate 99 percent of your suggestions here and believe it folks they work, if used properly. Very informative and practical. Thanks, Rob.
You start off each job as a producer, consulting your client and getting briefed on the project at hand. Then you become an engineer, dealing with recording gear and software, setting the mic position and levels. Next, you step up to the mic as an actor, bringing the script off the page and connecting with the listener. Meanwhile, the director in you sits behind the metaphorical glass, making sure the actor doesn't mispronounce a word or stumble through a passage of text. Then you're an editor, cleaning up the best take and sending the resulting audio to your client. You need to be able to perform all of these roles to a high standard, and the better you are at each, the more your business will prosper.
Congratulations! You should now have a finished voiceover recording. Save a final copy with the extension _master and use this version to save another copy in the format requested by the client. But don't think your job is done when you hand everything back to your producer‑self. Running a profitable home‑based voiceover business takes more than building and equipping a home studio and recording and editing audio files. You still have to design a web site, launch a marketing campaign, and secure new clients — all of which is something we'll look at another time.  
As the engineer, your key job is to select and set up the recording space, choose and position the microphone, set levels and make sure you're recording a good, clean signal at a healthy level. Like music, the louder the signal you want to record, the less audible the noise floor, but you don't want to have to speak louder than sounds natural, and you don't want to overcook things when tracking: any distortion will be very noticeable on an exposed voice part, and an otherwise great take with digital clipping won't be acceptable. If you notice clipping only when you start editing, software clip restoration tools might help to make the take usable, but it's not going to be perfect. Remember that although you may have needed to record 'hot' on analogue tape and older 16‑bit digital recording systems, modern 24‑bit A‑D converters can accommodate a much wider dynamic range, so you no longer have to track so loud: you can leave much more headroom.
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