5.2
11.3
11.4
11.6
10.7
11.8
11.8
11.4
5.3
6.8
5.3
5.1
5.1
5.5
5.5

5.8
13.7
14.1
13.5
13.1
15.1
13.6
13.9
5.4
7.6
5.4
5.4
4.9
5.2
5.7

4.1
n/a
n/a
n/a
n/a
n/a
n/a
n/a
3.6
4.1
3.6
3.7
3.5
3.7
3.7

5.0
7.3
7.0
7.6
7.6
7.8
7.6
7.5
4.8
4.2
4.3
4.3
3.8
4.6
4.4

4.9
n/a
n/a
n/a
n/a
n/a
n/a
n/a
5.5
8.3
5.2
4.8
4.0
4.8
5.5

10

Table 4: Multilingual zero-shot TTS SMOS/QMOS results on filtered MLS English test set with
prompts in different languages. YT/VB-Multi refers to YourTTS/multilingual Voicebox. “Ref” shows
the audio context language.

Ref=De

Ref=En

Ref=Es

Ref=Fr

Ref=Pl

Ref=Pt

VB-Multi (α = 1.0)

3.26±0.11
3.89±0.10

3.24±0.11
3.93±0.08

3.22±0.12
3.84±0.10

3.48±0.10
3.92±0.09

3.26±0.09
3.81±0.08

3.38±0.11
3.96±0.09

SMOS (target text = En)

QMOS (target text = En)

VB-Multi (α = 1.0)

3.29±0.12
3.67±0.09

3.17±0.13
3.48±0.09

3.29±0.12
3.45±0.11

3.08±0.12
3.31±0.12

3.35±0.12
3.75±0.11

3.21±0.12
3.35±0.13

YT

YT

5.4 Transient noise removal
Voicebox-Text-GuidedMultilingual UniversalSpeechGenerationatScale