App Overview

TROOPER Synthesizer icon

TROOPER Synthesizer

Yonac Inc. · Music

Thick basses, buttery leads, feathery pads — Trooper is a total synth explosion that crams it all and more in a neat little package

$3.49 · In-app purchases

PRICE
$3.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
70 ratings · Top 5%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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A product spec, screen plans, and build steps for your coding agent.

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What's included18 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for TROOPER Synthesizer: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Provide advanced sound editing features and presets.

Assumption to check: Limited sound customization options

Validate with people who use this workflow before building.

Hypothesis 2

Implement robust error handling and performance optimizations.

Assumption to check: Occasional app crashes during playback

Validate with people who use this workflow before building.

Hypothesis 3

Integrate MIDI support for enhanced user experience.

Assumption to check: No MIDI support for external devices

Validate with people who use this workflow before building.

Hypothesis 4

Create an interactive onboarding process to guide users.

Assumption to check: No tutorial or onboarding for new users

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Thick basses, buttery leads, feathery pads — Trooper is a total synth explosion that crams it all and more in a neat little package. It sounds HUGE, yet tweaks easy. It’s coated in analog “fat,” yet bursts with tonal surprises nestled across its controls. Get ready for an all-out sonic assault, because Trooper is here and it's our meanest, beastliest, user-friendliest synth yet! Many of Trooper’s parameters are meant to interact and meld together in novel ways. For example, the oscillator volumes —beyond just acting as mere blend knobs— vary the characteristics of the basic signal depending on how far they are “pushed". The emphasis is on providing warm and round basic tones with lots of variable harmonic content. The primary oscillators are backed by an audible LFO that is both a sound source and a wide frequency range modulator. This lets FM-based sounds to combine with traditional waveforms. A pink/white noise generator helps out pads and percussions, and insidiously changes tonality when added in small amounts. A new filter implementation complements the pugnacity of the signal generators. In its middish settings, the resonance can be characterized as “throaty.” The filter is capable of self-oscillating, and can be controlled via the keyboard. The mated ADSR envelope is shaped to provide tonal ‘immediacy’ and smooth frequency shifts. The amount knob has a wide range that changes the feel and shape of the envelope, especially when pushed above the mid-level. The output stage features a virtual VCA that imparts tones colloquially termed as “fat”. Extra modulation is provided by a non-audible LFO and a dedicated envelope. The LFO offers numerous wave shapes, BPM syncing, and key tracking. Its output is controllable via the mod wheel, velocity, or aftertouch. The Esprit parameter helps deploy some of the Trooper “special sauce.” Highly interactive with the stages preceding it, Esprit is known to be handy in tightening up bass tones, and in adding the "je nais se quois” to presets at large. The Get6 parameter is a one-touch ticket to big, mix-filling synth sounds. So whenever you’re lost in an empty mix…it’s got your six. The arpeggiator inspires rhythms with five algorithms, variable note value, octave range, and gate. The “Texturizer" purveys a wide range of modulation effects that include chorus, flanging, variable comb, resonant delay, and stereo imaging. The BPM-syncable two-tap delay has time and feedback controls per channel, and is tuned a little darker than our usual offerings. Trooper can run in monophonic or polyphonic mode, the latter providing up to 12 voices. Legato is available in either mode. The robust MIDI implementation also includes MPE support, and the synth is able to I/O MIDI performance data. The “MagTouch” virtual controller lets you to play and record (in AUv3 hosts so enabled) over the MPE protocol. MIDI learn is made easy via a visual interface, and users can save, patch-link, and share MIDI CC maps. Bluetooth MIDI input is also supported. The AUv3 implementation lets you to run multiple instances of Trooper in DAWs. Trooper’s fluid UI accommodates a wide variety of screen sizes and view configurations. Feature navigation is designed to be nonintrusive so that parameters can be accessed easily. The iPad implementation supports portrait layout, so that pretty much all is on one screen. Included are over 250 presets that range from deep basses to weird so-and-so's, stopping by many other sounds along the way. The powerful YPAT2 system helps you save, catalog, and share presets with ease. The standalone app provides a “Tapedeck” to record, save, and share your ideas on the quick. It features a built-in looper, and a metronome with configurable time signature. The standalone also features tap tempo, and MIDI clock syncing. DSP is in high resolution 64-bit, with native processing at up to 96kHz.

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Zustand
React Navigation
expo-av
MIDI.js
BUILD KIT DIFFICULTY
Advanced

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.