The Roland V-4 is a professional compact video switcher that also incorporates a capable 4-channel audio mixer, designed for small-scale live production, streaming, presentation, and basic broadcast applications. While its primary function is video switching between up to four HDMI sources (including cameras, computers, and media players), its integrated audio section is crucial for producing a complete, synchronized audio-visual program. The audio mixer allows the operator to blend sound from the embedded audio of the selected video sources with two dedicated external microphone/line inputs. This enables the addition of live commentary, voiceovers, or external music to the program mix, which is then embedded into the final HDMI output alongside the video.

The audio controls are straightforward and accessible on the unit's front panel, typically featuring level knobs for each of the four channels (two for the embedded audio from the video inputs and two for the external mic/line inputs), along with a master output control. The external inputs are usually combo XLR/TRS jacks, providing flexibility for connecting professional microphones or line-level devices. Some models may include basic tone controls, like a low-cut filter on the mic inputs to reduce rumble. The audio mixing happens in the analog domain before being digitized and embedded with the video, ensuring low latency and reliable synchronization—a critical factor for live production.

The Roland V-4's strength lies in its integration and simplicity. It provides a single, compact solution for users who need to switch video and mix audio without the complexity of separate systems. This makes it ideal for presenters, educators, worship teams, and small production crews creating webinars, live streams, or multi-camera recordings where clear, balanced audio is as important as the video. By handling both audio and video in one streamlined device, the V-4 simplifies setup, reduces potential points of failure, and allows creators to focus on their content rather than technical routing.