Ok, here it goes! I'm going to try to break it down for you. On the main page it's a female voice although very fast and high pitched you can almost hear Juan (American pronunciation "wan" if you speak a form of Spanish (and Spanish is a generic term that encompasses multi Hispanic languages) you might hear Juan which is loosely pronounced "hoo-wan", so, if you don't hear that "hoo" in the front of the name, more than likely it's "cuando". And on the reply page you (I) hear a male voice which to me is clearly "cuando". According to Bing, the English language is comprised of Old English, Danish, Norse, and French and has been changed by Latin, Greek, Chinese, Hindi, Japanese, Dutch, and Spanish (which Spanish? Only the powers to be know that one.) So, the same thing goes for this application. We (as users of such) have no idea which Spanish they (Duolingo) is using. Spanish technically from Spain but there are 21 other Spanish speaking countries where Duolingo could be using words from. Hence, one reply suggested that the male voice was Mexican. Could also be that words are from: Argentina, Bolivia, Chile, Colombia, Dominican Republic, Ecuador, El Salvador, Equatorial Guinea, Guatemala, Honduras, Nicaragua, Mexico, Panama, Paraguay, Peru, Puerto Rico, Uruguay, Venezuela. (If I missed any I'm sorry). Bottom line is, don't rely on one application. In the beginning, I had nine applications and they had their own quirks but do to space issues, I dropped down to two. The other problem with applications are, they are not definitive, you will always need something more. Depending what region you are from, you might want to talk to a native (Spanish) speaker. You'll get a lot more help that way. (Depending upon which Spanish they speak and what Spanish you are trying to learn). Hope this helped a little but more importantly didn't confuse you more.
Even though the female is harder to understand for me, I definitely think she sounds similar to a Mexican native. I live in Mexico and the biggest challenge is how fast and 'muffled' many native speakers sound to me because of my limited ability. I think listening to her is hard but helpful.
I know ya'll work hard to bring us this learning opportunity and I am very grateful. I think it would be very helpful to have a medium speed audio playback though (if you decide to make any changes along the way). Often the fast is to fast & the slow is way to slow (drags the time out so much). Just some feedback. I love the program and appreciate it non-the-less. Thanks!
Here's a list of all the question words: