Rock Band 4 requires $20 adapter to use last-gen instruments on Xbox One, but not PS4 - Polygon
How To: Assemble Your Rock Band Drum Kit | WIRED
Can I connect an e-drum kit for rock band 4 play without this insanely expensive adapter?! I want to buy a nice quality kit and play on rockband 4. But sounds like
Rock Band 4 Drums Backwards Compatibility: Everything You Need to Know – FuelRocks
PS4 Rock Band 4 Wireless Drum Set With Two Pedals. | eBay
Amazon.com: Rock Band 4 Band-in-a-Box Bundle - Xbox One : Mad Catz: Everything Else