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.
delayjavu - stereo reverse delay (auv3)
$1.99 · In-app purchases
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, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for DelayJaVu: 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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Hypothesis 1
Assumption to check: Limited user feedback on audio manipulation effects
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficulty in managing large music libraries
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Confusing user interface for new users
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
delayjavu - stereo reverse delay (auv3) delayjavu is an audio effect plugin that can run standalone, or in any au compatible host application such as logic pro or garageband. overview deja vu - french for "already seen". the brief, intense and often startling sensation that a current, new experience has happened before. delayjavu is a stereo reverse delay with independent delay times for the left and right channels. delayjavu works by capturing your dry signal in a delay buffer, which is then read backwards over a time period corresponding to a delay time. as the virtual delay head repeatedly scans back through the delay buffer, you hear segments your original dry signal, repeated in reverse. i think reverse delay is a really cool effect - one of my favourites in fact! i especially like its slightly unpredictable nature, making it a great effect to interact with, as you play. i don't recall seeing any reverse delay plugins with independent times for the left and right channels so that may be something unique that delayjavu has to offer. and the addition of modulation and variable stereo spread adds further creative options, while keeping delayjavu compact, super easy to use and very dsp-friendly. controls mode - off bypasses the effect and uses a "soft switching" aka "trails mode", to avoid pops and clicks. in l/r lock mode, the delay time is set to be the same for the left and right channel, and the parameter sliders will be "locked" to the same value when changed. in l/r free mode, you can set independent delay times for the left and right channel. time l / r - sets the delay time for the left and right channels independently, from 250ms to 2.5 seconds. interesting effects can be achieved by setting the delay times to be close, but not exactly the same. please note - unlike a "normal" delay where you will hear the sound repeat after the delay time specified, delayjavu doesn't quite work like that. the delay heads for both channels are always in motion and repeat their cycles according to the delay time. this means that sometimes the delay head will be "closer" to the incoming audio. in this case you may hear the first repeat almost straight away, with subsequent repeats occurring at delay time intervals when the feedback is > 0%. this is especially noticeable (and cool!) when running in free mode with different delay times. this is also the way many reverse delays are implemented and why this particular design doesn't lend itself to tempo sync delay effects as the repeats will not "quantise" to note length boundaries. feedback - sets the feedback / regeneration for the delay on both channels. mod - adds a variable amount of modulation to both channels. as each channel is modulated differently, this can produce a nice stereo effect. spread - at maximum, the left and right delay channels are hard-panned and have their own independent modulation applied. decreasing the spread parameter effectively narrows the stereo image of the delay and modulation all the way down to mono. mix - the mix control goes from 100% dry to 100% wet. at the centre 50% position, the dry and wet signals are evenly balanced. at 100%, you only hear the wet / processed signal. for more info and support please visit: www.waverley-instruments.com/robjackson
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.