We sold a bunch of DS01 way back and only have 1 multi-cab still installed and am working on getting that one replaced soon.

Several of the multi-cab systems eventually failed, basically the thing would go haywire and loose its mind, a cabinet would go out, lost programming, phones resetting, etc.

Sometimes a system reset would cure the problem for awhile. Usually after throwing some hardware at it (station mod, aux, saux, xaux or even the ksu) the bad component would be eventually determined.