1 Department of Electrical Engineering, École de Technologie Supérieure, Montréal, Québec H3C 1K3, Canada.
2 Centre for Interdisciplinary Research in Music Media and Technology, Montréal, Québec H3A 1E3, Canada.
3 Department of Design and Computation Arts, Concordia University, Montréal, Québec H3G 1M8, Canada.
4 École d'orthophonie et d'audiologie, Université de Montréal, Montréal, Québec H3N 1X7, Canada.

Speech takes place in physical environments with visual and acoustic properties, yet how these elements and their interaction influence speech production is not fully understood. While a room's appearance can suggest its acoustics, it is unclear whether people adjust their speech based on this visual information. Previous research shows that higher reverberation leads to reduced speech level, but how auditory and visual information interact in this process remains limited. This study examined how audiovisual information affects speech level by immersing participants in virtual environments with varying reverberation and room visuals (hemi-anechoic room, classroom, and gymnasium) while completing speech tasks. Speech level was analyzed using generalized additive mixed-effects modeling to assess temporal changes during utterances across conditions. Results showed that visual information significantly influenced speech level, though not strictly in line with expected acoustics or perceived room size; auditory information had a stronger overall effect than visual information. Visual information had an earlier influence that diminished over time, whereas the auditory effect increased and plateaued. These findings contribute to the understanding of multisensory integration in speech control and have implications in enhancing vocal performance and supporting more naturalistic communication in virtual environments.