Voice Over for Virtual Assistants: A Complete Guide

Virtual assistants are everywhere, from smart speakers and customer service bots to admin tools and healthcare reminders. But what truly makes them effective? Their voice.

The voice of a virtual assistant plays a huge role in whether users trust, engage, or abandon the interaction. 

Whether you’re building your own VA or refining an existing one, this guide will walk you through how to find, create, and optimise the perfect voice over, covering everything from tone and technology to trust and testing.

What is a Virtual Assistant Voice Over?

A virtual assistant’s voice over refers to the recorded sound of a VA’s responses and interactions with users. This encompasses both the tone, cadence, and intonation used by the VA, as well as any pre-recorded responses or dialogue options available.

It’s the “voice” of your VA.

According to Edison Research, 45% of the UK population owns a smart speaker, which is higher than the 35% of the US population [1]. People are searching for ways to make their lives more convenient, and virtual assistants are a popular solution. From setting reminders to answering questions, they have become an integral part of our daily routines.

Virtual assistants are also highly popular in corporate settings, too. Companies are incorporating them into their offices to streamline tasks, increase productivity, and cut down on employee workload.

However, with the increasing use of VAs, there is also a growing need for them to be trustworthy. After all, we are entrusting these devices with personal information and relying on them to assist us in various tasks.

How is a Virtual Assistant Voice-Over Created?

When you interact with a virtual assistant like Alexa, Siri or Google Assistant, the voice you hear is typically based on human voice recordings – either used directly or as the foundation for synthetic speech.

Human Voice Recordings Form the Base

A professional voice actor is hired to record a wide range of audio clips. These might include full phrases, single words, numbers, or even individual sounds. The goal is to capture enough variety and nuance so that the assistant can respond naturally across a wide range of situations.

Disclaimer: Mandatory consent is required from the person whose voice is being cloned. It is important for this person (usually a voice artist) to be aware that their voice is being used for production/business purposes.

Two Ways These Recordings Are Used

Once recorded, there are two primary methods for using the voice:

1. Pre-recorded responses: For assistants with a limited set of outputs – such as a customer service bot with defined scripts – the system simply plays back the most relevant clip.
2. Text-to-Speech (TTS) using a real voice: For more advanced virtual assistants, the recordings are used to train a neural TTS engine. This allows the system to generate new, dynamic sentences in the same voice, even ones the actor never recorded. This process is often referred to as voice cloning or synthetic speech.

How Does NLP Fit Into Virtual Assistant Voice Overs?

While voice over recordings provide the sound of your assistant, Natural Language Processing (NLP) is what enables it to understand and respond to users in a meaningful way.

NLP is a form of artificial intelligence that allows computers to interpret human language. It’s what makes it possible for your assistant to recognise speech, detect intent, and formulate responses, whether it’s booking an appointment or answering a product question.

This is why your choice of voice matters so much: it becomes the interface for all these interactions. A clear, natural voice helps users feel more confident and understood, especially when paired with a well-designed NLP system.

If your assistant is expected to handle a variety of tasks or emotional contexts (like helping someone in distress or providing sensitive information), pairing professional voice recordings with a strong NLP system creates the best user experience.

Why Does the Voice Choice Matter for Smart Voice Assistants?

Picture yourself in a car showroom, talking to the salesperson about the latest features of a new car. If that person sounds bored, untrained, or robotic, you’ll likely be put off or uninterested in what they have to say. 

On the other hand, if the salesperson has a friendly and engaging voice, you’ll likely listen more attentively and be more interested in what they have to say.

Similarly, if you’re making an important appointment over the phone, and the person at the other end sounds uninterested or disengaged, you may question their competence and professionalism. 

But if they respond with a warm, attentive, and competent tone, you’ll likely feel more confident and reassured about the appointment.

The same principles apply with the voice of a virtual personal assistant – you want to feel confident that the voice represents a competent and reliable tool. This is particularly important in industries such as healthcare, where patients may rely on virtual assistants for important medical reminders or instructions.

What the Research Says…

There are various studies into the importance of the voice used for VAs, and the effects different voices have on the end user. 

A 2024 publication titled ‘The Impact of Perceived Tone, Age, and Gender on Voice Assistant Persuasiveness in the Context of Product Recommendations’ produced some really important insights.

Here are some of those highlights:

Persuasion	News stories read by virtual voice assistants are perceived as more interesting if the VA voice speaks to them in a happy voice, rather than a sad one. People deemed middle-aged male and younger female VA voices as more persuasive in comparison to other voice types. VA users mostly prefer female and extroverted voices
Trust	The tone of the VA voice and perceived age and gender influence trust in relationships between the user and VA. A sense of urgency in a VA’s tone increased the user’s trust in emergency situations. A ‘warm’ VA voice increased the user’s expectations of receiving a good quality service/response from the VA.
Supporting Purchase Decisions	People are more likely to complete a product purchase when the VA provides positive product recommendations in a positive tone. A neutral tone for reading negative reviews often led to people not purchasing the related product.

Defining a Virtual Voice Assistant’s Persona

When designing a smart voice assistant, you need to consider the persona that the VA will portray. This persona should align with the target audience/end users, and be consistent with the brand or company the VA represents. 

We recommend considering the following factors:

• Use case: Consider the VA’s primary purpose and how users will use it. A personal assistant who schedules appointments may have a more professional persona, while a home assistant may have a more friendly and casual persona.
• Target audience: Understand who will be using the VA, and tailor its persona to appeal to them. For example, a VA designed for children should have a playful and approachable persona, while one for business professionals should have a more serious and efficient persona.
• Brand personality: If the VA is being developed for a specific brand or company, its persona should align with the company’s established brand personality. This will help maintain consistency and strengthen the connection between the VA and the brand.
• Voice tone and style: The tone and style of the VA’s voice can greatly impact its perceived persona. An upbeat, natural tone helps your VA feel more human and relatable, while a formal tone may be more suitable for professional settings.
• Language and vocabulary: The language and vocabulary used by the VA should also reflect its intended persona. Use simple and easy-to-understand language for everyday use, while using industry-specific jargon or technical terms for business-related VAs.

Testing & Optimising Your VA Voice

If you want your virtual personal assistant to be as effective as possible, A/B testing with different voices can be a useful tool. By testing different voices and gathering feedback from users, you can determine which voice is most appealing and engaging to your target audience.

For example, you might start by testing different voice styles (e.g., friendly vs. formal), then compare how they affect key engagement metrics like task completion or user feedback.

You can then review and analyse the data to determine which voice is most effective for your virtual assistant.

Where to Find the Right Voice Over Artist for Your Virtual Assistant

There are various places you can find voices for your virtual assistant, depending on which method of voice creation you choose. Some possible sources include:

• Voice over talent agencies
• Text-to-speech software
• Freelance voice actors
• AI voice generation platforms

Voice over agencies are ultimately one of the best options if you’re looking for a professional voice over. These agencies have a large pool of talent with thousands of voices to choose from and can provide high-quality recordings.

On top of that, you’ll be assigned an account manager and project manager who will liaise with you to understand your project needs and find the perfect voice for your brand or project. This can save you time and effort in finding an appropriate voiceover artist on your own.

Need Help Choosing a VA Voice?

With over 40 years of experience, Matinée Multilingual is a trusted partner in delivering VA voice overs.

We provide professional virtual assistant voice over services for a wide range of industries and applications.

Whether you need a friendly and conversational tone for your customer service chatbot or an authoritative and knowledgeable voice for your medical or financial VA, we will find the perfect voice for your brief.

You can find more information about our voice over services below.

…or, fill out an online form to talk to us about your specific project. If you have any questions or concerns, our team is always available to assist you and provide recommendations.

Get expert voice-over support for your virtual assistant project and speak to our team today.

FAQs

What is an Example of a Voice-Based Virtual Assistant? + –

The most well-known examples of voice-based virtual assistants are Alexa (Amazon), Siri (Apple), Google Assistant (Google), and Cortana (Microsoft). These virtual assistants are able to perform a wide range of tasks, from setting alarms and reminders to giving weather updates and even ordering items online.

How Do Virtual Assistants Work? + –

Virtual assistants work through the use of Natural Language Processing (NLP) technology. This means they are able to understand and interpret human speech, allowing for a more seamless interaction between the user and the virtual assistant.

What Makes a Good Virtual Assistant Voice? + –

A good VA voice is clear, confident, and emotionally neutral or friendly. It should align with your brand’s tone, speak at a comfortable pace, and be easy for users of all backgrounds to understand.

 

Can I Use a Regional UK Accent for My Virtual Assistant? + –

Yes, many brands choose voices with regional UK accents to sound more relatable and locally relevant. 

That being said, you should be conscious of your target audience and where your VA will be used. For example, if your target audience is global and your VA will be used in various countries, a regional accent may not be the best choice as it can create barriers for understanding.