Snare roll fill
ProTrap
Three bars of groove, then a two-beat triplet snare roll that swells into the crash.
The pattern
Bar 1
Closed hat
Clap
Kick
Snare 2
Crash
Snare
Bar 2
Closed hat
Clap
Kick
This is a Pro lesson
Get every bar of the pattern, which finger plays what, and the practice steps, with feedback on every hit as you play.
See Pro