Speech Scale Studio — Flash TTS & Voice Production Workbench

1. Script & Voice Config

Model Architecture

Creative Audio Presets

Voiceover Script 174 chars

+ Pause 400ms + High Emphasis + Pitch Shift + 1.15x Pace + Soft Breath

Voice Timbre / Tone Deep Warm (130 Hz)

Speech Cadence & Pace 1.00x (145 WPM)

Prosody Inflection Depth 75%

Synthesis engine initialized. Ready to generate.

2. Acoustic Timeline & Audio Stream

Gemini 3.8 Flash TTS — Master Audio Stream 48.0 kHz • 24-bit PCM Duration: 4.8s

00:00.0 / 00:04.8

Volume

TTFB (First Packet)

42 ms

Audio Duration

4.82 s

Model Real-Time Factor

0.08x

Estimated Batch Cost

$0.00017

Phoneme & Word Alignment Tracks Click any chunk to isolate and seek

Architecture Tradeoff Analysis Based on Google Gemini 3.8 Audio release

Feature	Gemini 3.8 Flash TTS	Gemini 3.8 Flash-Lite TTS
Primary Use Case	Studio voiceovers, video dubbing, expressive drama	High-throughput IVR, notifications, real-time agent responses
Sample Rate / Fidelity	48 kHz Studio Stereo (Full harmonic overtone)	24 kHz Crisp Mono (Optimized speech band)
First Audio Packet Latency	~40 – 65 ms	~12 – 22 ms (Sub-perceptual conversational)
Cost per 1M Output Characters	$1.00 / 1M chars (~$0.0035 / min)	$0.25 / 1M chars (~$0.0009 / min)

Speech Generation Architecture & Production Workflows

Dual-Engine Strategy

Gemini 3.8 Flash TTS delivers 48 kHz studio-grade vocal nuance with micro-prosody and emotional inflections suitable for narrative, media dubbing, and video storytelling. Flash-Lite TTS provides up to 4x throughput at a fraction of the cost for high-scale agentic workflows.

Local Procedural Formant Modeling

This workbench simulates vocal acoustic tracts directly in your browser using multi-pole resonant bandpass formant filtering (F1–F4 vowel resonances) combined with pink noise aspiration envelopes. Every synthesized track can be auditioned and exported as a valid 48kHz PCM WAV file.

Prosody & SSML Tag Injection

Add precise pause markers ([pause=400ms]), pitch shift contours, and cadence modifications to your script. The waveform display offers scrubbable playhead seeking, word-level alignment time markers, and live real-time factor metrics.