> ## Documentation Index > Fetch the complete documentation index at: https://help.ondeckapps.com/llms.txt > Use this file to discover all available pages before exploring further. # Audio & Visual Analysis Modules > Modules for monitoring audio levels, visualizing frequencies, and transcribing speech. Relay provides deep audio integration for monitoring your production environment. These modules rely on inputs configured in your **Global Audio Settings**. ## SPL Meter The SPL Meter module displays sound level data from any Mac audio input. ### Setup 1. Open the **Global Audio Settings** and configure an input in the **Measurement** tab. 2. Add the SPL Meter module to a tile and select that measurement input. 3. Select your desired weighting (**A**, **C**, **Z** for flat, or **C-A** to show the difference between the two) and time weighting (**Fast** or **Slow**). ### Features * **Calibration:** Apply an offset (in dB) within Global Audio Settings to match a known reference meter. * **Averaging:** Optionally average readings over a configurable window (in seconds) instead of showing the instantaneous level. * **History graph:** Show a running graph of raw or averaged SPL, with configurable history length and graph height. * **Warning and alert thresholds:** Set two dB thresholds with independent colors for normal, warning, and alert states, so a tile visibly changes color as levels climb. * **Bar meter:** Optionally show a bar-style meter alongside the numeric readout, with separate upper and lower limits for the C-A comparison view. * **SPL Logging:** Relay can record SPL data directly to CSV files when Live Mode is active, complete with a pulsing green indicator on your tiles. Logged exports can include raw dBFS and peak values in addition to the weighted SPL reading. *** ## Real-Time Analyzer (RTA) A visual analysis module that breaks down your audio inputs into discrete frequency bands in real-time. ### Setup 1. Configure a measurement input in **Global Audio Settings**. 2. Add the RTA module to a tile and select the input. You can add more than one input to the same RTA tile to compare sources directly. ### Features * **Display Modes:** Choose between standard bar graphs or a filled-curve display. * **Resolution:** Six band resolutions from 1-octave (10 bands) up to 1/48-octave (478 bands), trading detail for a busier display: 1-octave, 1/3-octave (31 bands), 1/6-octave (61 bands), 1/12-octave (120 bands), 1/24-octave (240 bands), and 1/48-octave. * **Peak Hold:** Enable peak-hold to track the highest frequency levels over time, with a configurable decay rate in dB per second. * **Time smoothing:** Fast or Slow smoothing controls how quickly the display responds to level changes. * **Range:** Set the visible frequency range and dB range independently, and apply A/C/Z/C-A weighting to the analysis. * **Warning colors:** Optional threshold-based coloring, same as the SPL Meter. * **No-input state:** Shows a clear "No audio input available" message instead of a blank tile when no input is selected. *** ## Spectrograph A scrolling waterfall view that visualizes audio frequency distributions over time, helping you spot persistent feedback frequencies or structural imbalances. ### Setup 1. Configure a measurement input and set a custom display color in **Global Audio Settings**. 2. Add the Spectrograph module to a tile. ### Features * **Visual Heatmap:** Frequency intensity is displayed as color density over time, with configurable scroll rate and a choice of frequency scale. * **Color maps:** Fire/Plasma, Green Phosphor, Purple Glow, Amber, or a Custom map. * **Range:** Set the dB range independently of other modules, and apply the same A/C/Z/C-A weighting options as the SPL Meter and RTA. * **Link to RTA:** Optionally link the color and range settings to a companion RTA tile so both stay in sync. * **Color Syncing:** The module automatically utilizes the custom color you defined for that input in your global settings, making it easy to identify which mic you are looking at. * **No-input state:** Shows a clear "No audio input available" message instead of a blank tile when no input is selected. *** ## DAW Transport Keep your dashboard in sync with your playback rigs by monitoring and controlling supported DAW (Digital Audio Workstation) transport workflows. ### Setup 1. Connect your DAW via MIDI or network protocol in the External Devices settings, and choose the matching transport type: Pro Tools HUI, Logic Pro HUI, Reaper HUI, Reaper MCU, Cubase/Nuendo HUI, Digital Performer HUI, Generic HUI, or Generic MTC/MMC. 2. Add the DAW Transport module to a tile. ### Features * **Transport Monitoring:** See exactly when your DAW is playing, stopped, or recording. * **Dashboard Control:** Send Rewind, Stop, Play, Record, or Fast Forward directly from your Relay tiles without switching applications. * **Command mode:** Choose Automatic, MMC, or MCU to control how transport commands are actually sent, depending on what your DAW and connection type support. * **Display mode:** Show a running clock or SMPTE-style timecode, depending on the transport type. *** ## Live Transcription Converts a selected audio input into scrolling text on the dashboard. This is incredibly useful for providing live cues or context to operators without an intercom. ### Setup 1. Add inputs via the **Transcription** tab of your **Global Audio Settings**. 2. Add the Live Transcription module to a tile and select the input. ### Features * **Advanced Controls:** Fine-tune auto-gain sensitivity and engine preference per-input. * **Word Substitutions:** Easily filter or replace specific words on the fly (e.g., replacing a speaker's verbal tick). * **Profanity Controls:** Automatically mask or remove profanity from the transcript. The filter catches inflected words and text that is already censored, and its settings persist between sessions. * **Automation Triggers:** You can use word detection to trigger automation workflows. * **Transcript tools:** Show live transcript entries, copy or export the transcript as text, clear it, or jump to the most recent entry. ## Global Audio Settings Relay uses a centralized configuration manager for all audio sources, split into two tabs: * **Measurement** — inputs used for visual monitoring (SPL Meter, RTA, Spectrograph). Add inputs, set a calibration offset in dB, and choose a custom display color for visualization graphs. * **Transcription** — inputs used specifically for speech-to-text, including the auto-gain, engine preference, word substitution, and profanity controls described above. ## Permissions that matter These modules commonly depend on microphone access, Speech Recognition access, and a usable audio input source. If system audio transcription is part of the workflow, screen or system-audio capture permissions may also matter depending on the capture path. ## Troubleshooting ### Transcription does not start Check microphone permission, Speech Recognition permission, whether another app is already using the same input, and whether Live Mode is required for your current setup. ### SPL Meter is paused or flat Check the selected input source, microphone permission, whether Live Mode is enabled, and whether your calibration assumptions are reasonable.