Something fun to goof around with? Price is right. I think pretty much all the 2000’s Flex Wave Crates used this aux board for reverb, delay, chorus, flange and combos of same. Header ties to power, in, out and a (I think 10k) pot that takes it through each effect. If you’re interested, you’ll know what I’m talking about. Any flex wave schematic should show hookup. Actually are good sounding effects. Just bought a batch on eBay years ago to fix a problem in my little Crate that turned out to be something else.