The On-U Sound Pay It All Back compilation series has served to include both recent releases, alternate mixes, unreleased material as well as selections from forthcoming albums. Volume 4 came out in 1993 and features two Dub Syndicate tracks (both later released on the band's own Echomania album) as well as five from the funk-reggae supergroup, Strange Parcels (featuring members of Tackhead) and a stunning collaboration between Norman Grant (of the Twinkle Brothers) and a Polish folk group called the Trebunia Family Band.