"SMILE CAN BE HEARD IN ONE'S VOICE" How can voice transformation impact your CSAT or sales rate?​

What if an advisor’s performance could be increased by up to 20% just by adding a smile to a voice?

Let’s be honest together: yes we’ve already fallen in love with a voice (either a radio speaker, a singer, or someone we’ve never met, on a phone call). You could say, come on, we all know what is voice. But are we sure we can really understand it?  

We record it, we transcribe it to text, we sometimes translate it, or even compress it… but can we identify if a voice is better, more efficient than others?

We often advise our team members to smile during their conversations, because we say that smile can be heard in one’s voice, but can we measure the impact of a smile on a company’s CSAT or sales rate?
And can we help advisors to smile (even if sometimes they don’t want to)?

Well, the answer to these questions today is…

YES we can.

Thanks to the development of advanced research in cognitive sciences, we are gaining new insights into how speech and music create emotions in each of us.

‘Smile can be heard in one’s voice’

We all have this baseline in mind and you might wonder what’s the point at this stage… well we have managed to add – real time, at scale – emotions on our team members’ voice: either smile, happiness… and assess the impact on their performance.

We also managed to modify the voice timbre to make it more intelligible – if needed, with effects hardly noticeable on customer side and are currently working on other effects like trustworthiness.

You can hear a smile… and when you do… you’ll smile back

To do so, we have partnered with AltaVoce (a French start-up created by CNRS* researchers) and its team of neuroscientists and signal processing engineers. This awesome team is working on the impact of voice modifications on the interlocutor’s behaviour … so applied to us: how improving our advisors’ voices changes the way they are perceived by customers, and how it can affect their performance.

Potential in every voice call

In theory, this solution can be used in any kind of activity: inbound/outbound, customer service, sales,…and any language!
And the first results obtained so far have been incredible!

We A/B tested this cutting-edge technology during several months on outbound sales campaigns or inbound customer service with a prototype which emphasizes the smile in a voice, or improves its intelligibility.

What you can expect


+8% to +30% conversion rate improvement [Outbound sales campaigns for an internet provider]
+8% CSAT Improvement [Inbound customer service for a telco provider]
+3% to +6% Sales/hour improvement [Outbound sales campaigns for a media – paid TV provider]


The tool is pretty simple to use, it is just a piece of software installed on the agent’s desktop, transformations can be managed remotely through a customer dashboard. It doesn’t require any IT integration and can work on any telephony system using softphones.

Of course the transformation is subtle enough to be hardly noticeable by the customer, we don’t want that he feels you have ingested helium just before the call!

In bonus – Sample of the cheesiest pick-up lines we [actually] considered using to illustrate this article

“I smile every time you call. Every time I can hear your voice”
“Your voice is my favorite song”
“The sweet melody of your voice is better than any music”
“Did you just rip out my voice box? Cause you leave me speechless

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