I have the Todd Johnson Walking Bass Line Module System Volume 1. I'm still working my way through it, but so far I'm really enjoying it. This is top notch and highly recommended. I do have a question though for Todd or anyone else familiar with the Vol 1 material. I am trying to apply the triad modules to Summertime (hayward & gershwin). So far, I am unable to come up with a set of modules that sound decent when trying to walk this song. Perhaps this song is better served by the scalar approach (disc 2 - which I don't have yet). Any thoughts?