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The classic Baddeley and Hitch (1974) model divides workingmemory into domain-specific subsystems and a shared, do-main-general central executive, which plays a role in allocatingresources to items stored in the subsystems. The nature of thisresource—in particular, its quantization (discrete vs. continu-ous) and the flexibility of its allocation—has been studied ex-tensively in the visual domain, with evidence from experimentsusing continuous response measures providing support formodels with flexibly and continuously divisible resources. Itremains unclear, however, whether similar mechanisms medi-ate the division of resources in phonological working memory.In this paper, we show that, despite representational differencesbetween visual and auditory processing, continuous measurescan also be employed for studying phonological workingmemory. Using such measures, we demonstrate that the prin-ciples of resource division in visual and phonological pro-cessing are indeed similar, providing evidence for a domain-general mechanism for allocating working memory resources.