Our drum configuration is a little unorthodox, so in order to understand our drum charts, you need to understand our setup.

We typically use large plastic trash bins for the bass drum, and buckets for the mid-range drums. Hence "Trash (bass)" and "bucket" in the charts. ("Bell" should be self-evident - think cowbell.)

All of our drums (so far) are played with sticks. The bass player has a mallet for tone strikes in his/her dominant hand, with a regular drum stick in the non-dominant hand for rim strikes. This changes how some common rhythms are played, and we've had to adapt to this hand/stick requirement.

The bucket player has two thick (1/16) timbale sticks. On the bucket, you can strike the center (typically with a raised circle as a "target"), the flat area around this circle ("off-target", for a less rich tone), or a rim strike.

We also use a modified Larry Morris / box drum notation system:

O - tone sound
X - rim strike
Ox - flam
t - a "touch", typically an off-target tone hit for the bucket player