Resoniq has made a 1:1 replica of the rare ISF-1 expansion cart for the Ensoniq Mirage. It is available pre-built or in DIY kit form. You can find full details at Resoniq here.
If you are not familiar with the ISF-1, ISF stands for Input Sampling Filter. According to this previous post it increases the Mirage sample rate to 50K and contains a 150db/octave roll off filter. You can find a pic of the orginal in that post.
Note Resoniq also appears to be working on a 1:1 replica of the Ensonic DMS-8 rackmount sampler, the Fata Morgana. More info on that to come...
