BrianD is right on, the voice recording software is just fine in the computer. You can Google different thing like "voice banking phrases" and stuff like that. You will come up with some good ideas from different sites, like the ALSA and others. Then just start a folder in your computer to save each file "phrase". This way it will be your voice for each phrase you make. Modeltalker is a good free software that you can download and do the sample sentences, then you send them back and they send you the full list of 1600 sentences. The only problem with Modeltalker is it can be very sensitive with the headset you use, background noise, speech volume, pitch. The following is from an email they sent me regarding the headset...
Microphone:
We now *require*use of a wired, head-mounted microphone with a USB interface. There are three important advantages to using a USB headset: 1) The headset will maintain a constant distance and orientation between your mouth and the microphone. This is extremely important for consistency from one recording to the next; 2) Many computers, especially laptops, have less-than-optimal sound cards. A USB-based mic will have its own built-in sound processing hardware and will bypass the sound system of your computer; and 3) A headset mic is less likely to pick-up ambient noise. Many consumer-grade USB headsets will be acceptable as long as they do not have Automatic Gain Control (AGC). The Logitech G330 USB Headset or Logitech H530 USB Headset (widely available and priced in the $35-$50 range) are possible choices. There are also Sennheiser mics. We don't have hands on experience with the Sennheiser SC 260 USB but we have had very good results with users recording with Sennheiser USB mics, however, they are a bit pricier at $85-$105.
Also, the Modeltalker is your voice computerized...you can listen to samples on their website.