Re the comments above on the SLS "Spoken Urdu" materials, I want to add a bit of background.
The course was originally published as "A Course in Urdu" by McGill University's Institute of Islamic Studies in 1967 in hardcover, large format (8 1/2 x 11 inches). The book is largely in transliteration, and the print is quite small but still readable. When SLS republished the books in 1975, it did so in a smaller format, with the already-small print being very, very small indeed. You can still read it, but I wouldn't recommend it unless your eyes are pretty good. I think that the books are probably the most comprehensive introduction to Urdu available, but they do reflect the technology of the time (type-written).
The audio to the first volume of the course has been floating around on the internet for quite a while, but the quality is not very good. I haven't seen any audio online for the rest of the course. I don't know what the quality of the audio as obtained new from SLS might be, but I suspect that it would still exhibit the technology of the 1960s. Whether obtaining it would be worthwhile for a prospective learner of Urdu, I can't say, but note that a more modern textbook with audio has recently been published that, even if not as comprehensive, might offer a more up-to-date introduction to the language:
Beginning Urdu: A Complete Course
Author: Joshua H. Pien
Publisher: Georgetown University Press
As for a similar book by the author of the SLS Urdu book, M. A. R. Barker, his "A Course in Baluchi", noted by ilmari above, was also published by McGill University in 1969 in two volumes. In format and approach, it's virtually identical to the Urdu course, so anyone interested in the Urdu course might take a look at it to see how it's organized. The books, which are almost impossible to find for sale anywhere, have been put online by the university itself at: http://www.library.mcgill.ca/hostedjour ... 01021.html
as well as at the archive.org link provided by ilmari.
This course had audio, but I've never been able to find it. I wrote to Barker himself a number of years ago, and even he didn't have the audio, but he said the University of Minnesota had it. That university was supposedly going to digitize it and put it on line, but it never seems to have happened. I wrote e-mails a couple of times to the person who was listed as being in charge of that project, but never got a response.