Inspect audio and preview speech

Open AUDIO after configuring your audio devices. The workspace shows the audio inside Radio Bench. It cannot measure the radio's RF output.

Choose the displayed source

Select Auto, RX, or TX above the instruments. Auto follows receive or transmit activity. RX and TX keep the display on the selected path.

Live means fresh samples are arriving. No recent audio means the retained display is stale. No audio means no samples are available for that subject.

Read the instruments

Instrument	What to look for	Display controls
Spectrum	Audio frequencies, passband edges, unwanted tones, and broad noise	Smooth, Range, and marker visibility.
Waterfall	How those audio frequencies change over time	Time span, Floor, Range, and markers.
Oscilloscope	Waveform shape, peaks, and flat-topped clipping	Time window, Range (dBFS), Zero line, Clip warning, and Peak / RMS levels.

Use the display menu in each plot header. A longer time window reveals slower changes. A shorter window reveals individual waveform cycles.

At a 0 dBFS oscilloscope range, the edges represent digital full scale. A tighter display range magnifies quiet audio. Reaching a magnified display edge alone does not establish clipping.

Peak measures brief maxima. RMS describes average signal level. Persistent clip warnings require checking the gain before the measured point.

Reset display restores display defaults while retaining your RX/TX source selection. Display controls do not adjust audio gain or processing.

Understand the TX subject

The label changes with the signal under examination.

Label	Signal shown	What it does not establish
TX MIC	Raw microphone capture while recording a preview	Processed speech quality or TX output level.
TX	Processed audio during ordinary voice TX or preview playback	RF power, ALC, modulation quality at the radio, or physical keying.
TX SPEECH	Speech entering the RADE encoder, after input conditioning and before clipping	Encoded modem output or the effect of TX output gain.
TX TEST	Output test tone	Microphone or speech-processing performance.

Passband markers apply to processed TX audio. They do not describe raw microphone capture, the RADE speech input, or the test tone.

Compare speech processing

TX mic preview works with USB, LSB, AM, and FM. It records up to 15 seconds and plays through your selected RX output.

Preview does not assert CAT PTT or use the selected TX output. Confirm that RX output goes to headphones or speakers. Routing RX output into a radio can still trigger external VOX.

Select an analog voice mode and open AUDIO.
Select Record beside TX mic preview.
Speak a short sentence at your usual microphone distance.
Select Finish, or allow the 15-second limit to finish the take.
Listen as the take starts playing through the processing chain.
Select Loop to repeat it while adjusting TX AUDIO controls.
Compare one change at a time, then select Stop.

Select Play to hear the retained take again. The preview volume changes listening level independently of TX output level.

Start with modest input gain and no compression. Compare noise reduction, bass, treble, compression, and the available transmit filter controls. See transmit setup for their locations.

Preview Record is separate from Audio/IQ WAV recording. The preview take is a temporary comparison sample, not a saved station recording.