User blog comment:Kitahara/Recording drum expedition success rates/@comment-25730832-20150223094147/@comment-25832576-20150224010847

Interesting. I'm currently around 170 tries with Expedition 21 (0) with a 12% base rate. This is putting the sparkle bonus rate at 16% for exp21. Expedition 37 got halted for a while because of the event so I can't say anything about that yet. But I'm expecting the rate to plummet from its current 20%.

I'll resume posting weekly updates soon.