PaceCraft — AI Audio Workout Studio

Guided Audio Workouts

Choose a workout to edit in the studio or start running immediately with audio cues.

✨ Prompt to Workout Generator Gemini 3.8 Flash

Enter your intervals in plain English. AI parses durations, budgets word counts for natural breathing room, and writes cues that preview upcoming intervals for mental preparation.

💡 Edit sections below or re-submit prompt to refine.

Workout Title

Duration & Details

INTERVAL TIMELINE (CLICK ANY BLOCK TO JUMP) ● Walk ● Run ● Core ● Cool-Down

ACTIVE AUDIO RUN

Foundation 30: Walk + Run + Core

-30:00

WALK 🌿 Warm & Welcoming

The Step Out (Intro & Walk Start)

Target: Easy Warm-Up Pace

"Press 'Start Run' to begin your session. The coach voice will guide you every 2 minutes with music transitions."

Next: [02:00] Posture & Arrival in 02:00

Runner Metronome / Audio Beat (115 BPM, auto-ducks on voice)

Generate New Audio Workout

Create a custom guided walk, run, and core session with tailored interval frequencies, emotion mapping, and coaching tone.

Workout Title

Workout Category

Total Duration

Coach Cue Frequency

Coaching Style / Persona

Workout Goal / Special Focus (Optional)

Use Google Gemini API for generation (Requires Gemini API key in Settings) If unchecked, the built-in athletic generator creates all emotion-mapped cues instantly.

Voice Engine & Emotion Settings

Choose between Google Cloud TTS (with SSML Emotion Prosody), ElevenLabs (Ultra-Realistic Human Coach), or Enhanced Browser Speech.

Select Voice Provider Choose which voice synthesis engine powers the coach's audio.

✨ Gemini 3.8 Flash Expressive TTS Active (Voice: Sola)

Google's conversational running coach voice Sola powered directly by gemini-3.8-flash-tts via Google AI Studio. Synthesizes human-like cadence with emotion styling and natural breathing intervals.

✨ Google Cloud Journey Voices Active (1M Chars Free / Month)

Google's conversational Journey voice models (en-US-Journey-F and en-US-Journey-D) are active with your hardcoded API key. All cues are pre-rendered into high-definition 24kHz audio with zero playback latency.

Google Cloud API Key Saved locally in browser localStorage and hardcoded in app.

Google Cloud Voice Model Journey voices (e.g. en-US-Journey-F and en-US-Journey-D) are Google's flagship conversational coach voices.

Google Cloud Voice Model Journey voices (e.g. en-US-Journey-F and en-US-Journey-D) are Google's flagship conversational voices. SSML emotion tags automatically modulate pitch, breathing breaks, and countdown intensity.

ElevenLabs API Key ElevenLabs delivers the most human, emotional, and expressive voice AI available today.

ElevenLabs Coach Voice PaceCraft modulates stability and style exaggeration dynamically by section (e.g. higher expression on run surges, soothing stability on recovery walks).

Detected OS / Browser Voice On macOS and iOS, choose Siri, "Ava (Premium)", "Samantha (Enhanced)", or "Daniel (Enhanced)" for much higher quality than legacy system voices.

Base Speaking Rate: 1.05x 1.05x is crisp and motivating. Section emotion modifiers scale around this base rate.

Pitch Adjustment: 0.0 Default is 0.0 semitones.

Enable Browser Speech Fallback if API Key is not entered

Optional: Google Gemini API Key Used only if you check "Use Google Gemini API" when generating custom workouts in the AI Generator tab.