The following article from our online documentation describes how RadCaptcha generates the audio code: http://www.telerik.com/help/aspnet-ajax/captcha_audio.html
By default RadCaptcha tries to speak the characters using the SpeechSynthesizer.Speak
method, which uses the Operating System's default voice, and I guess it is a male voice. If the control does not have enough permissions to call this method, it concatenates the .wav files placed in the App_Data/RadCaptcha
directory, which are by default words spoken by a female voice. To always use the files from the directory set the CaptchaImage-UseAudioFiles
property to true
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