> For the complete documentation index, see [llms.txt](https://docs.behringer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.behringer.com/control-surface-and-app.md). # Control Surface and App ## User Interface Navigation The graphic user interface is organized into the following sections: 1. Home: Main Screen (pictured below), Meters and Automix 2. Main Mix, Input Channels and Talkback 3. SD Recorder 4. Settings To navigate: * Swipe horizontally to move between the sections or processing slots * Swipe vertically to select channels (when in the Main Mix, Input Channels and Talkback section) * Tap on the mixer icon to open the main overview and its processing * Tap on the SD card icon to open the recorder pages * Tap on the gear icon to open the general settings and preferences * When the Home, SD Recorder or Settings section is opened, tap the same icon again to close that open section and go back to the selected input channel. The four red infinite knobs set the channel trim of one block of channels at a time. In the MAIN overview screen, tap a channel to assign the knobs to its block: * Channels 1–4 * Channels 5–8, when a FLOW 4VIO is connected * AUX IN and USB / BT AUX IN and USB / BT are stereo channels, each with a single trim covering both sides of the signal. In this block the two left knobs both set the AUX IN trim, and the two right knobs both set the USB / BT trim. The multi-purpose knob to the right of the LCD is used as follows: * Turn the knob to navigate through on-screen parameters. A blue frame around the element indicates the selection. * Press the knob, accessing the selected parameter, then rotate to adjust its value. * Press the knob again to exit the parameter editing and go back to navigation. NOTE: Parameters can also be selected directly by tapping on the touchscreen. Some parameter values can also be adjusted immediately with touch and drag gestures. However, the multi-purpose knob as described above will yield more precise adjustment. ## 4V App The 4V App is available for iOS, Android, macOS and Windows. It provides: * Level meters for all input channels * Channel fader and panning control * Phantom power switching per channel * Recording start and stop The channel fader sets the digital trim of the channel; FLOW 4V and FLOW 4VIO have no manual analog gain control. FLOW 4V connects to the app over Bluetooth or USB. To connect over Bluetooth, start the pairing process in the Settings section on the FLOW 4V. FLOW 4VIO has no Bluetooth and connects to the app over USB only. Because the FLOW 4VIO has no display or channel controls of its own, the app is required to operate it as a standalone unit. When a FLOW 4VIO is connected to a FLOW 4V, its channels are controlled from the FLOW 4V. On both units, USB remote control and USB audio share the same USB 2.0 Type-C port labeled AUDIO and can be used at the same time. When a FLOW 4VIO is used as a StageConnect Client without a computer attached, the app is not available. In this case, its channel trim and phantom power are set from the StageConnect Host. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.behringer.com/control-surface-and-app.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.