> 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/channels-and-processing.md). # Channels and Processing ## Main Mix FLOW 4V's MAIN MIX bus provides the following processing options: * 3-band EQ featuring: * Low shelf filter at 50 Hz * Mid band at 1 kHz, Q = 0.25 * High shelf filter at 14 kHz * Limiter with an adjustable threshold * Post-fader delay for aligning the audio output to a delayed video ## Channel Processing FLOW 4V's four local channels (MIC/LINE 1–4) as well as FLOW 4VIO's additional four channels (MIC/LINE 5–8) offer the following processing options: * Filter: low-cut and high-cut filter with adjustable cut-off frequencies * Tone EQ: one-knob tone control for balancing bass against treble ranges easily using tilt-EQ * Dynamics, choose ONE from the following: * Expander with adjustable threshold * One-knob Compressor with a single intensity control * Limiter with adjustable threshold * Pre-fader delay for time-aligning various input sources before the mix Phantom power (+48 V) is switched per channel in each channel's INPUT screen, for both the FLOW 4V's own channels 1–4 and a connected FLOW 4VIO's channels 5–8. Disconnect ribbon microphones and other vulnerable equipment before enabling phantom power. ## AUX IN / SYNC Channel The stereo signal connected to the AUX IN 1/8" TRS connector is routed to the AUX IN channel on FLOW 4V. The AUX/SYNC input can also temporarily receive a timecode synchronization signal on its tip connector. To synchronize FLOW 4V to this external clock signal, select the FREE RUN timecode mode and tap on RECEIVE. See [Timecode Modes](/sd-recording-and-playback.md#timecode-modes) for more details. ## USB / BT Channel The USB / BT channel supports both recording and playback of different signals. The Source switch on the bottom of the USB In screen selects the signal that is monitored. To record the USB or Bluetooth signal, select it in the Record Enable screen. Note that only one can be active at the same time. The USB / BT channel can be recorded to the SD card only; it is not available as a USB recording channel. ## Talkback Talkback can be received through a Bluetooth audio connection or through the 1/8" TRRS PHONES jack using headphones with an integrated microphone. Both signals are summed and sent to the PHONES output, allowing communication with the recording engineer or production assistants. The Talkback signal can be recorded separately alongside the input channels to the SD card or through USB, making it available for post-production and editing. ## Automix Automix automatically shares the overall gain between all assigned channels, giving preference to the loudest active channels, while attenuating the others. This is especially useful in situations where mic signals all contain acoustic bleed between the other channels, for example panel discussions or interviews. The automixer consists of two screens in the Home section: the first screen shows the gain changes applied by the automixer to the assigned channels. The second screen allows assigning individual input channels to the automixer and bypassing the processing. ## Easy Level The Easy Level function automatically adjusts the trim of active input channels so the post-fader signal peaks at approximately −18 dB. In the METERS screen, touch and hold the channel group areas 1–4 or 5–8 to apply Easy Level to the selected channels. ## PHONES Output and STEREO OUT (FLOW 4V) The STEREO OUT 1/8" connector (TRS) carries the post-fader MAIN MIX signal. When SEND is active in FREE RUN timecode mode, the timecode signal replaces the MAIN MIX at this connector. See [Timecode Modes](/sd-recording-and-playback.md#timecode-modes). The PHONES 1/8" connector (TRRS) provides a copy of the MAIN MIX, either pre- or post-fader. When SOLO is active, the solo bus replaces the MAIN MIX. Talkback is always summed with either the MAIN MIX or the solo bus in the PHONES output. ## PHONES OUTPUTS (FLOW 4VIO) When connected to a FLOW 4V, PHONES OUTPUT 1 mirrors the FLOW 4V's STEREO OUT, while PHONES OUTPUT 2 mirrors the FLOW 4V's PHONES output. --- # 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. 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