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.
Auto Bass is a MIDI generator app with an editable algorithm
$3.99
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.
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Auto Bass AUv3 MIDI Generator: 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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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
Assumption to check: Limited pattern customization options
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No ability to share patterns
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of visual feedback during playback
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No tutorial or onboarding 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.
Auto Bass is a MIDI generator app with an editable algorithm. You can create basslines or melodies automagically with Auto Bass. Set the algorithm parameters in your taste for generating the best basslines. - Complexity breaks the longer notes into shorter notes. - Density sets the note/rest ratio. - Spread sets the range of the notes in the piano roll. - Offset shifts the notes on the piano roll. - Swing shifts the start position of the every other note in the sequence. - Slide sets the percentage of the sliding notes in the sequence. You can change the gate length and velocity of the notes globally with the gate and velocity parameters. Gate variety and velocity variety knobs introduce randomisation to the notes. The edit menu provides basic editing tools: - Accent mode lets you add accented velocity to the tapped note on the piano roll. - Slide mode lets you add slide to the tapped note on the piano roll. - Move mode lets you drag the notes on the piano roll up and down to change their pitch. - Transpose changes the key of the whole sequence. - Nudge moves the whole sequence left or right. You can set your bassline pattern's duration with between 1-bar long to 64-bars long. Walk type rearranges the notes on the piano roll without regenerating the whole sequence. With a MIDI keyboard or a MIDI sequencer, you can transpose your bassline. Also, there's an edit menu on the top right side of the app which you can add accents to your notes, transpose them or nudge them to left or right. You can also export a MIDI file of your pattern and import it to your DAW for further editing or sharing. The AUv3 plugin exposes all parameters as AU parameters, so you can modulate/automate them with a compatible AUv3 host app. Auto Bass has a music theory engine with +100 scales, you can also use your custom ScaleBud 2 scales as well. With BrainBud, you can change the key/scale of Auto Bass along with other compatible apps. Please note that Auto Bass is a MIDI app. The standalone version has an optional internal synth where you can enable or disable on the settings menu. The AUv3 plugin requires an audio app for output. For the AUv3 functionality, it needs to be hosted within an app such as AUM, Loopy Pro, Cubasis, Logic Pro, Nanostudio, Drambo, or apeMatrix etc.
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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.
Not assessed in a Build Kit yet.
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.