chain rattle on ICE Sprint X Tour

[UpWrong]

My Sprint X Tour has a chain rattle coming from the rear in pretty much any gear. Rattle stops when freewheeling. My guess is that it's the chain on the chain keeper for the rear suspension idler, so I've softened the suspension by one setting (from 80-90Kg to 70-80Kg) so that there will be more deflection of the chain. The chain is also very close to the rack where it attaches to the swing-arm pivot but I think its the chain contacting the chain keeper which is causing the rattle

[UpWrong]

Yep, the softer suspension setting has (largely) cured it.