as with the resonance of clattering steel weaponry , the duller sound from the slap of heel against leather sandal had grown in volume too , but the worst of all the aural intrusions came from the babble of a dozen different dialects of indian speak , being exercised in many full , crudely un-censored , masculine voices and which had all become noisily coherent to him even there in his cramped upstairs office cubicle .