Cheetah 18
Almost nothing is documented about the Cheetah 18. It appears to have been a synthesizer model. The brand's numeric designations for other units (the MS6, MD16, SX16) suggest it may have been part of a broader lineup. No period literature, specification sheet or review has been located to confirm its exact nature, features or release window.
No listing for the Cheetah 18 appears in the period issues of Sound on Sound, Studio Sound or Communications Technology sampled during research. The only Cheetah unit that surfaces in those pages is the SX16 sampler. A classified ad in Sound on Sound (1996, p.216) offers it with 2Mb RAM, eight outputs, disks, boxed with manual, at £375. That leaves the 18 absent from the published record. Whether it was a prototype, a very short production run, or a model that never reached retail is unknown.
If you own a Cheetah 18 or have seen documentation - a manual, a catalog page, a price list - the Archive would welcome a note.
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