It’s finally out:
Behrendt, F (2014) Creative Sonification of Mobility and Sonic Interaction with Urban Space: An Ethnographic Case Study of a GPS Sound Walk. In: Gopinath and Stanyek (eds) Oxford Handbook of Mobile Music, Volume 2, Oxford University Press: 189-211
Note: there is also Volume 1 of The Oxford Handbook of Mobile Music.
Remember, ten years ago…when many of the contributors met for the first time at the Mobile Music Workshop Series that I used to organise with Atau Tanaka, Lalya Gaye (and initially Lars-Eric Holmquist) between 2004 and 2008…and the book we published:
Kirisits, Nicolaj., Behrendt, Frauke, Gaye, Lalya., & Tanaka, Atau. (eds.). (2008). Creative Interactions – The Mobile Music Workshops 2004-2008.Vienna: University of Applied Arts. Download pdf. See http://www.mobilemusicworkshop.org/