Watch the Doobie Mod online guitar lesson by Chris Buono from Funk Fission
Doobie Mod is the first riff to combine strummed chords with the comping techniques discussed throughout the course: palm punching, percussive scratches, popped hybrid picked notes, etc. As always, approach this riff slowly so you can properly learn the coordination this demands.
When it comes to the palm punches remember to refer to the standard notation staff to see where you should be fretting or just dampening the strings as that is intentional for both economic fingering and timbral variations. In regards to fingering, a good example is the notation for the palm punch at the downbeat of beat 2 that spells a Bbsus2 chord. From there, you immediately play that chord after the punch and if you watch the video closely (or in slomo) my fret hand fingers are set to play the Bbsus2 when I make that punch.
At the 2nd 16th of beat 3 there’s a lone major 2nd interval that’s carefully hybrid picked after a palm punch on the downbeat. These rough sounding intervals are the main ingredients to diatonic sus chords and I try to use them on their own when improvising as well as in riff composition. And, not just in the high registers as heard here, but in lower pitch registers on the wound strings with or without distortion, too. You could also try lone minor 2nd intervals as I do at times. If you wanted to stay diatonic to the Cm vibe in Doobie Mod try replacing the major 2nd in the riff with a D-Eb combination instead. For example, play the riff as is and then when you get to that point play the aforementioned interval on the third and second strings at the 7th and 4th frets respectively. From there, you might want to adjust the octave to the 3rd position, 5th string/3rd string C octave making the whole riff a whole lot tighter.