Publisher : Hal Leonard
Ed Friedland - Expanding Walking Bass Lines 
Series: Bass Instruction 

A follow-up to Building Walking Bass Lines, this book approaches more advanced walking concepts, including model mapping, the two-feel, several 'must know changes,' and other important jazz bass lessons.
This book includes a unique code that provides access to audio tracks online, for download or streaming. The tracks include PLAYBACK+, a multi-functional audio player that allows you to slow down audio without changing pitch, set loop points, change keys, and pan left or right.