Significantly complex tone/voice interactions have been identified in Phuthi. This phenomenon results in what is analysed at one level as massive and sustained violations of locality requirements on a H tone domain arising from a single H tone source, e.g. surface configurations of the type HLH (in fact H L* H) are possible where all H syllables emanate from a single underlying H source, given at least one L syllable being depressed. Such tone/voice configurations lead to grave problems for any theoretical phonology that seeks to be maximally constrained in its architecture and operations.