Bassy Riffs Rhythm exercises
There are many mp3 files with "rhythm etudes" here.
I have recorded them as part of my own practice.

Practice suggestions:
1. Listen to the etude a couple of times so you "know the rhythm"
2. Practice playing along with mp3-file.
3. Practice playing with just drum accompaniment
4. Avoid playing with mistakes!!! If mistakes start to happen
They are based on: Here are the rhythms used in these exercises
They are organized according to the bar lines, and numbered bars

So file BellBassyRiffs_P4_T1T2_90.mp3 will be based on rhythms in bar 1 and 2