Creating Voices for IVR Prompts

February 12, 2016 | Angela Dougherty

One of the first tasks that needs to be undertaken when setting up a pay-per-call campaign in Retreaver is setting up the IVR prompts. Of course, you can use Retreaver without having any IVR prompts, but they are a great way to filter out unqualified callers and ensure your call center only gets high quality calls. Retreaver also supports text-to-speech prompts, but they don’t create the sense of professionalism and warmth the voice of a real human can.

Finding the right voice

Finding the right sound for your brand is difficult. You need to consider your target audience. What type of voice will they be expecting to hear when they call in? Is it an authoritative, business-like, professional voice? Or are you trying to confer a feeling of warmth and trust? You want to set the tone for the call, putting the caller in the correct state of mind, whether that is at ease, or hurried, or eager to purchase.

If you are in the US, perhaps an American sounding voice will be best, but overseas a UK English accent will probably work better. We highly recommend using or VoiceBunny to find a voice actor. After posting a job you will get many custom auditions covering a range of vocal styles and prices to allow you to choose which actor you want to work with.

We recently posted a job on and had over 30 customized auditions to listen to within 24 hours. After selecting the voice actor we thought suited our brand the best, we received multiple versions of the prompt in high-quality WAV format.

As auditions start coming in, make notes about each actor and revise your job posting if needed to hone in on the right sound. The voice actors are notified whenever you click the “Like” button next to their audition, so make generous use of it. Because you are going to be editing the audio file to remove noise and optimize it for phone play, it isn’t as important to find an actor with a perfect quality microphone as it is to find someone who you think sounds best for your brand.

Coaching your new voice actor for the right sound

After selecting the voice actor you want to work with, we suggest listening to their audition recording many, many times. Think about how words sound, the inflection of the voice, and determine how you want the prompt to be paced. By providing specific instructions, you will ensure you get exactly the recording your brand needs.

After providing feedback, await the submission from the voice actor. Be sure to review the actor and release payment promptly. If everything has worked out well, you will be able to post private jobs for this actor again in the future.

Editing the audio for optimal phone transmission


Audacity ScreenshotAfter finalizing the deal and accepting the files, open up the audio files in an audio editor. We recommend using the free and open source Audacity. It is available for Mac and PC. You should have received files in a raw, uncompressed WAV format. This lossless format is important because editing a lossy file like an MP3 will only cause further degradation of audio quality.

You probably received a file with many versions of the prompt. You’ll have to isolate the version of the recording you want to use by selecting it with the selection tool, and copying and pasting that audio into a new file.

Then, remove any background noise. Highlight a silent section of the clip with the selection tool, and select Noise Removal from the Effect menu. Click the “Get Noise Profile” button, and then remove the noise by clicking OK at the bottom of the dialog.

Now that the audio has been cleaned up and you’re happy with it, you’ll need to downsample the audio to 8kHz for play over telephone lines. The maximum frequency of the audio that goes out over phone lines is ultimately limited by the old analog phone technology and limitations of bandwidth. 8kHz is the standard sampling rate used in phones, for comparison, FM radio uses 22050Hz. This 8kHz signal is carried over the internet in a digital form represented in 64kbps. Select “Resample…” from the Tracks menu, and enter 8000 and push OK.

Listen to your downsampled recording. You will notice that there has been a loss of range, the recording may now sound somewhat muffled.

In many cases, removing audio in the lower ranges will make for a crisper, sharper recording that is easier to understand. If you feel this is necessary, experiment with the High Pass filter in the Filter menu. Enter a lower end cutoff frequency of about 400Hz, and see how that affects the audio. Human speech ranges from a low of 60Hz for men, 160Hz for women, to a maximum of about 7000Hz.

For the purposes of telephony, the transmitted range is approximately between 300Hz and 3400Hz. It is a good idea to clean up your audio so it falls between these ranges so that nothing unexpected happens down the pipeline. Audio that falls outside this range may show up later as audible glitches or clicks.

Finally, you may want to add some dead space at the end of the recording so that it doesn’t repeat too quickly, to give the caller some time to press a button. Click near the end of the file with the selection tool, and under the Generate menu, choose “Silence…”. Add 5 to 10 seconds of silence and see how that sounds.

Once your recording sounds perfect, export it to a WAV file so it’s ready to upload to Retreaver, and save your Audacity project.

Enabling Offers For Mobile with Call Tracking

September 8, 2012 | Jason Kay

OK, let’s face it. Email may not be dead, but the way people use email has changed forever. Where 20% conversions on short-form mortgage lead offers used to be commonplace, today affiliates are struggling to get people to fill out forms. Times have changed, and net-savvy consumers are steering clear of offers delivered by email in fear of getting deluged with spam. Worse yet, many people are now checking their email on their phone, which means they aren’t going to spend time filling in a lead on a desktop-optimized website.

So what is an affiliate network owner or offer manager to do? We propose a solution that seamlessly integrates the old with the new. With Retreaver, you can attach phone numbers to your offers, and route the calls to a call center that is ready to collect leads and close sales over the phone. We automatically integrate with affiliate network software like LinkTrust, allowing your affiliates/Publishers to create numbers that track back to them for each of your phone-enabled offers, right from your existing Publisher interface. The calls track just like you would expect: when someone calls the number, it counts as a click, and when the call meets your sale criteria, it counts as a sale.

Adding Retreaver to existing lead-gen offers is a great way to increase revenue.

By adding Retreaver to your affiliate marketing arsenal, you can increase your existing revenue streams and branch out more aggressively into mobile advertising. Best of all, there are no contracts to sign or minimum charges. Just pay for the phone lines and minutes you use. We can even automatically manage the number of phone lines assigned to each Publisher, deleting them as they fall out of use, saving you as much money as possible.

If you have mortgage, insurance, health insurance, education, or automotive lead offers and you aren’t providing your Publishers with phone numbers, you are missing out on a huge revenue stream. Talk to us about adding phone lead-gen to your existing offers and find out how much more revenue you could be bringing in with Retreaver.