The present study examines the acoustic realization of the English, Japanese, and Spanish /k/ in the productions of two groups of English-Japanese bilinguals [first language (L1) English-second language (L2) Japanese and L1 Japanese-L2 English] and one trilingual group [L1 Spanish-L2 English-third language (L3) Japanese]. With the analysis of voice onset time (VOT) as a proxy for the degree of cross-linguistic influence in each language, this experiment compares the production patterns of L2 and L3 learners of Japanese and explores the effects of language mode and cognate status on the speech patterns in each of the languages of these bilingual and trilingual individuals. By manipulating the degree of activation of the target and non-target language(s) with the use of cognates and non-cognates in monolingual, bilingual, and trilingual experimental sessions, this study investigates static as well as transient phonetic influence. Even though these bilingual and trilingual speakers produce language-specific VOT patterns for each language, the acoustic analyses also reveal evidence of phonetic convergence as a result of language mode and cognate status. These results show that trilingual speakers are able to maintain language-specific phonological categories in their L1, L2, and L3, overcoming long-term (static) traces of one language influencing the other, despite evidence of short-term (dynamic) cross-linguistic influence.