SpellSynth: Retro Vocal Synth

Talking AUv3 + Phonics games

$3.99 · Designed for iPad. Not verified for macOS.

1.2.1: PHRASE mode polish — new GAP knob for live word-spacing control, smoother per-word playback, cleaner empty starting screen. Solo project — feedback welcome. SpellSynth is a playable love-letter to the 1978 spelling toy that taught a generation to read — rebuilt for iPhone, iPad, and Mac, with five game modes, a crunchy VFD display, and three vintage voice characters across two decades of speech-synthesis history. Tap a letter and it speaks. Type ANY word — your name, a made-up word, this week's vocabulary list — and SpellSynth speaks it back. EVERY WORD SPEAKS The 500+ bundled words across 20+ themes use a hand-recorded retro voice. Anything else — a name, a foreign word, a made-up word, your kid's spelling list — falls back to the system speech engine, gets routed through whichever voice character you've picked, and caches to disk so the second tap is instant. There's no "we don't have that word" anymore. • FREE PLAY — type any word, hear it spoken. The retro segmented display animates every keystroke. • SPELL — SpellSynth says a word. You spell it. Three mistakes and you get the answer, then try a new one. Tap HINT to reveal a letter when you're stuck. • MYSTERY WORD — the classic "guess the hidden word" game. You get the category and the first letter free; pick letters until the word reveals itself. Six wrong guesses and it's game over. • SAY IT — listen-and-repeat mode for pronunciation practice. SpellSynth spells the word letter by letter, then says it whole. Tap REPEAT to hear it again, NEXT for a new word. • PHRASE — type a multi-word phrase, hear it spoken whole through your chosen voice. The VFD cycles word by word as audio plays. Twelve preset phrases included. THREE VINTAGE VOICES Pick a voice character in Settings. Each one draws from a different era of speech-synthesis history, applied to every word you hear: • 1968 ODYSSEY — calm, deep-baritone monotone with a deliberately slow cadence. Fixed-pitch formant synthesis at ~65 Hz, time-stretched 1.6×. Aesthetic homage to the late-60s sci-fi AI voices. • 1978 LPC — the original Speak & Spell character. A 10-pole LPC vocoder driven by the actual TMS5220 chirp ROM, the same speech algorithm Texas Instruments shipped in the toy. Buzzy, granular, unmistakable. • 1986 DECTALK STYLE — fixed-pitch impulse train through formants extracted from your input. Modelled on the Klatt-style synthesis that defined Hawking's iconic computer voice. Deliberate, monotone, emphatically computery. • DEFAULT — clean system speech, no extra processing. For when you just want clear pronunciation without the retro stamp. All three work on every word — bundled or live-typed — and cache separately, so toggling between them is instant after the first play. Choice persists across launches. PLAY WITH A MIDI KEYBOARD Connect a USB, Bluetooth, or Network MIDI keyboard to your iPad and the keypad becomes playable from real keys. Notes C4–C#6 trigger letters A–Z, so any 25-key controller covers the whole alphabet. Pairs naturally with the LPC voice for a Speak & Spell instrument on your desk. BUNDLED AUDIO UNIT (AUv3) SpellSynth ships an AUv3 instrument extension, so the same voice engine loads inside GarageBand, Logic Pro for iPad, AUM, Loopy Pro, Cubasis, and any AUv3-compatible host. Type a word and it speaks live. Eighteen parameters cover pitch, speed, bit-crush, sample-rate reduction, filter, envelope, LFO, stutter, MIDI shaping, and voice character. Six factory presets cover the most-used sounds. A serious MIDI surface for performers: sustain pedal (CC 64) for hold-and-release phrasing, Channel Pressure (aftertouch) routable to any parameter, three velocity curves (Soft / Linear / Hard), an adjustable pitch-bend range from ±0 to ±12 semitones, and 14 MIDI Learn targets covering every performance knob — bound CCs ride along with the preset. Stutter locks to the host tempo (1/4, 1/8, 1/16), and a Letter Map mode maps A–Z onto MIDI notes 60–85 so you can sequence spelling right in your DAW. Perfect for producers chasing that Kraftwerk / Stereolab / Broadcast sound.

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1.2.1 — PHRASE mode polish. • New GAP knob on PHRASE — live-tune the silence between words from 50ms to 500ms while you listen. Default 100ms (down from 150ms in 1.2.0) for tighter delivery. • Smoother per-word playback. Words now stitch through a single audio path, removing a small click some users heard on word boundaries. • Cleaner starting screen — PHRASE opens to an empty canvas. Type your own phrase via KEYPAD or TYPE; the RECENT row remembers everything you've played this session.

The developer, Chih Han Lin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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    Seller
    • Chih Han Lin
    Size
    • 63.9 MB
    Category
    • Music
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © Nonotoday LLC