Decimort is a nice VST plugin designed to bring you the "old school" sound. The complex and advanced signal processing algorithms within Decimort simulate the behaviour of the whole sampling path which exists in every AD/DA converter.

Decimort has no internal aliasing. The only aliasing effect present in the system is the modelled aliasing of the classic samplers we modelled when creating it. Undesired artefacts are not present in the processed signal. Only wanted artefacts remain. A further very steep low-pass filter, synchronised to the signal frequency, can be applied at the end of the signal path to absolutely ensure that no unwanted out-of-band signals remain.