Remodulate DSD to higher clock rates, eg. from 64fs to 256fs.
NativeDSD offers a service where you can buy remodulated DSD, which has been remodulated in software (HQPlayer Pro) to higher clock rates. They claim that this pushes noise further into the inaudible spectrum. Given that 64fs material is plentiful but higher clock rates are not, this is a way to get the stated benefit of higher DSD clock rates for the music that we have available.