6Same trend is observed with SIM-r. We present SIM-o to be consistent with Table 3

13

Voicebox=0=0.3=0.7VALL-E212223242526NFE0246Inference time (10s audio) 20.4X222324252621NFE23456WER222324252621NFE0.5750.6000.6250.6500.675SIM-r222324252621NFE2.93.03.1WER222324252621NFE160180200220FSD12345678Seconds23456WER12345678Seconds0.20.30.40.50.60.7SIM-r(a) English

(b) French

(c) Spanish

(d) Portuguese

(e) German

(f) Polish

Figure 4: Each subplot considers one of the six target language and shows SIM-o (speaker similarity)
as a function of prompt audio duration in seconds for cross-lingual style transfer from different source
language. We set the classifier-free guidance strength (α) to 1.0 and use midpoint ODE solver with a
NFE of 32.
Voicebox-Text-GuidedMultilingual UniversalSpeechGenerationatScale