Amy Nicola McBride Fishtail makes generative MIDI feel more like composition than AI prompting because it does not ask the producer to describe a song and wait for a black-box model to return music. It builds MIDI from rule-based musical decisions: sections, keys, modes, meters, cadences, voices, expression, intonation, takes, routing, and export choices. For RobSonic readers who work with iPhone, iPad, Mac, AUv3 hosts, Logic Pro, AUM, MPE instruments, microtonal systems, and generative composition tools, Fishtail matters because it treats generation as an editable musical form rather than a prompt result.
The official Fishtail website describes the app as a generative MIDI instrument for iPhone, iPad, and Mac that lets users compose, arrange, and perform complete musical forms. It also states a crucial boundary: Fishtail does not use AI to generate music. Its output comes from algorithmic rules grounded in music theory. KVR reported on August 31, 2026, that Amy Nicola McBride released Fishtail as a generative MIDI instrument and composition system for Apple platforms. The KVR product page lists Fishtail as a macOS and iOS MIDI Generator with AU and standalone operation, version 1.0.1 on Mac, version 1.0.2 on iPhone and iPad, and introductory pricing through September 9, 2026.
The important distinction is authorship. Fishtail can generate complex MIDI, but it does not replace the producer’s compositional role. It gives the producer a structured system for building, retaining, rearranging, routing, tuning, and exporting musical material.
Why Generative MIDI Needs A Different Conversation Than AI Music
The music-tech world often treats every generative tool as part of the same AI conversation. That flattens important differences. A prompt-based AI system may generate audio or MIDI from text, image, style cues, or learned patterns. A rule-based generative system uses musical logic, constraints, probability, and algorithmic relationships that the user can shape more directly.
Fishtail belongs to the second category. The App Store listing for Fishtail says the app composes complete musical forms, does not use AI to generate music, and creates output through algorithmic generation grounded in musical theory. It also makes clear that Fishtail generates MIDI rather than sound, so users must route it to synthesizers, samplers, or other receiving instruments.
That matters because MIDI generation leaves more of the production identity in the user’s hands. The chosen synth, sampler, orchestral library, drum instrument, tuning setup, effects chain, mix, automation, and arrangement decisions all remain outside the generator. Fishtail sends notes and musical structure. The producer decides what those notes become.
For RobSonic readers, that makes Fishtail less like an auto-song machine and more like a composition engine that can sit inside a real production workflow.
How Fishtail Builds Complete Forms Instead Of Loops
Many generative MIDI tools focus on short patterns. They create arpeggios, riffs, random melodies, Euclidean rhythms, chord progressions, or evolving note streams. Those tools can inspire a track, but they often leave the user to build the larger structure manually.
Fishtail takes a broader approach. Its official site highlights sections, keys, modes, meters, cadences, and compositional character. The Fishtail User Guide explains that an Arrangement contains one or more section tiles, and each section can carry its own number of bars, key, mode, time signature, cadence, role, and treatment. Supported time signatures include 4/4, 3/4, 6/8, 2/2, 5/4, 7/8, and 9/8. Modes include Ionian, Major, Mixolydian, Dorian, Lydian, Aeolian, Harmonic Minor, Melodic Minor, and Phrygian.
That is why Fishtail feels closer to composition than looping. A producer can generate a multi-section form, not just a repeating cell. A section can develop, refrain, shift meter, change mode, or carry a cadence decision. The app also offers Structure controls such as Composer, Voices/Layout, Breathing, Density, Rhythm Motion, Bass Pedal, and Soprano Pedal.
This gives users a language for form. Instead of asking an AI model for a mood, the producer shapes the musical skeleton.
Why Composer Modes Make The System Feel Directed
Fishtail’s Structure panel includes several Composer settings: Imitation & Invention, Counterpoint, Fugue State, and Dub Gravity. Those names matter because they suggest different generative behaviors rather than generic randomness. The User Guide says the Composer choice selects the composition method, while Voices/Layout selects active main voices.
That makes Fishtail feel directed. A producer can choose whether the piece should lean toward imitative material, counterpoint-like movement, fugue-related behavior, or dub-influenced gravity. The system does not merely throw notes across a grid. It applies a compositional method before generating a take.
This is also where Fishtail differs from many “AI music” discussions. The user does not outsource the whole creative identity to a sentence. They choose a musical process. They decide density and rhythm motion. They set breathing, which controls continuity and spacing. They define sections and cadences. Those choices make generation feel more like composition design.
The result may still surprise the producer. That surprise comes from a rule-based musical engine operating inside constraints the producer can understand.
How The Seven Voices Create Arrangement Logic
Fishtail routes generated MIDI through seven musical parts: Bass, Tenor, Alto, Soprano, Bloom Bass, Bloom Octave, and Shimmer. The User Guide lists these outputs as named AUM ports on iPhone and iPad, plus corresponding CoreMIDI sources on Mac. The combined “00 All” output carries all generated parts together, while outputs 01 through 07 let users route each part to separate instruments.
That matters because arrangement becomes part of the tool. A basic generative MIDI plugin might output one stream and leave the producer to separate roles later. Fishtail gives the generated material a part structure from the beginning. Bass can drive one instrument. Tenor and Alto can support harmony. Soprano can carry upper movement. Bloom Bass, Bloom Octave, and Shimmer can add extension and atmosphere.
This approach makes Fishtail useful for multi-instrument setups. On iPhone or iPad, the User Guide describes routing the seven named outputs in AUM to seven receiving instruments. On Mac, the standalone app publishes eight named CoreMIDI sources, while Logic Pro can route Fishtail output into multiple receiving software-instrument tracks by MIDI channel.
For producers, this means Fishtail can sketch an arrangement, not only a motif.
Why Retained Takes Make Generation Less Disposable
Generative tools often fail when they make ideas too temporary. A user generates something interesting, but the next click replaces it. The session becomes a chase for luck rather than a composition process.
Fishtail’s Takes system addresses that problem. The official site says users can retain, reorder, and hand off exact generations at whole-piece boundaries. The User Guide explains that a Take is one completed set of MIDI created by Generate, and that the Takes page can list exact retained generations. It also explains that a new take can become “Next” while the current take keeps playing, then hand off at the natural end of the whole piece.
That handoff design matters. The producer can generate a new version without interrupting the current one. They can compare takes, reorder them, and move through them at musical boundaries. KVR’s product page also states that retained takes can be compared, reordered, and handed over at whole-piece boundaries.
This turns generation into a selection process. The producer can keep exact versions, audition alternatives, and decide what belongs. That feels much more like composition than prompt-chasing because the material does not vanish when the next idea arrives.
How Whole-Piece Boundaries Support Performance
Fishtail is not only for offline generation. It also supports performance-minded handoff. The User Guide explains that a “Next” take can wait while the current take plays, then become Current at the natural whole-piece boundary. It also describes Play in Order for retained takes, where the app advances through the displayed take order at whole-piece boundaries.
That matters because generative music can feel chaotic if changes arrive in the middle of a phrase. Fishtail avoids that by respecting form boundaries. A producer can prepare a new take while the existing one plays, then let the app switch at a musical end point. This is closer to conducting or arranging than simply triggering random material.
Ableton Link support adds another performance layer. The official site says Fishtail supports Ableton Link tempo, beat, phase, and optional transport synchronization. The User Guide explains that the standalone Mac transport uses Ableton Link beat and phase when a Link session is active, while the iPhone and iPad version can sync with compatible music apps.
For live electronic sets, ambient performance, or generative scoring, this boundary-aware handoff can keep generated music from feeling abrupt.
Why Intonation Makes Fishtail More Than A MIDI Sketchpad
Fishtail includes seven tuning systems: Equal Temperament, Just Major, Just Minor, Pythagorean, Dub Intonation, Super Symmetry Intonation, and Werckmeister III. The User Guide explains that users can set an exact reference frequency, with presets such as A3 = 220 Hz, A3 = 216 Hz, and C4 = 256 Hz. It also notes that the exact reference field accepts frequencies from 0.03125 to 2000 Hz.
This matters because generative MIDI often assumes 12-tone equal temperament. Fishtail treats tuning as a first-class part of the composition system. It can output normal MIDI, pitch-bend-based tuning, per-part pitch bend, or MPE bend depending on platform and receiver setup. It can also export MTS and Scala tuning files, and the official site mentions experimental analogue CV file packages.
That puts Fishtail in a more serious compositional space. A producer can explore just intonation, Pythagorean relationships, historical temperament, or Fishtail’s own Dub and Super Symmetry tunings. The generated MIDI can then drive instruments that support the needed tuning method.
For RobSonic readers interested in microtonal harmony, MPE instruments, or nonstandard pitch systems, this is a major reason to pay attention. Fishtail is not only generating notes. It is generating them inside a tunable musical world.
How MPE And Pitch Bend Keep Tuning Practical
Microtonal composition becomes difficult when the receiving instrument cannot express the tuning. Fishtail addresses this with multiple output modes. The User Guide says Normal 12-ET cannot express a non-equal tuning table by itself. For live tuning, users can use matching pitch-bend or MPE receivers, or export MTS or Scala files into compatible instruments.
That practical warning matters. Fishtail’s tuning depth only becomes audible if the receiving setup can follow it. On iPhone and iPad, output options include 00 All bend +/-2 st, 01-07 split bend +/-2 st, and MPE bend +/-48 st. On Mac, options include Global bend +/-2 st, Per-part bend +/-2 st, and MPE bend +/-48 st. The receiver’s bend range and channel mode must match the selected mode.
This is where Fishtail feels like a serious MIDI instrument rather than a casual generator. It does not pretend microtonality happens automatically. It gives users several routes and explains the tradeoffs. One combined pitch-bend stream cannot independently tune simultaneous notes. Split routing and MPE can handle more complex cases, but only when the receiving instruments are configured correctly.
The result rewards producers who care about pitch systems and instrument routing.
Why MIDI-Only Output Protects The Producer’s Sound Identity
Fishtail creates MIDI, not audio. The User Guide states this directly: Fishtail does not contain a synthesizer for its generated parts, and a separate receiving instrument is required. Some users may see that as a limitation, but it is also the app’s greatest strength.
MIDI-only output keeps the sound identity open. A generated bass part can drive a Moog-style AUv3 synth, a sampled upright bass, a modular-style software voice, or an external instrument. Soprano can trigger a string patch, FM bell, vocal pad, or pluck synth. Bloom and Shimmer can feed atmospheric instruments or granular textures. The same take can sound completely different depending on the receivers.
This connects naturally with RobSonic’s bassline synthesis guide, because generated note structure and synth design shape each other. A bass line needs more than pitch. It needs gate behavior, envelope shape, saturation, filter motion, sub weight, and mix placement. Fishtail can create the musical part, but the producer chooses how that part speaks.
This is one reason Fishtail feels less threatening to authorship than prompt-based audio generation. It creates control data. The user still builds the sound.
How Standard MIDI Export Makes It DAW-Friendly
Fishtail supports Standard MIDI export, including combined and route-separated files. The User Guide says Export Take writes a combined Standard MIDI File, while Export Channels writes a tempo track and separated route tracks. It also says section exports can write only the selected processed section. The App Store version history notes that version 1.0.2 added time signatures to exported MIDI files so changing meters appear correctly in DAWs such as Logic Pro.
That export behavior matters because generative playback alone can feel temporary. Export turns a generated take into editable DAW material. A producer can bring the MIDI into Logic Pro, split parts across instruments, edit notes, thin the arrangement, adjust velocity, swap sounds, quantize selectively, or score the material.
Fishtail also supports .fishtail project save and recall, which helps preserve the generator state. Standard MIDI export gives compatibility, while .fishtail projects preserve the app-specific work. That combination fits real production: keep the source recipe when needed, and export MIDI when the music needs to move into the DAW.
This makes Fishtail useful beyond generative performance. It can become a sketching, arranging, exporting, and editing tool.
Why CV File Packages Point To Experimental Hardware Workflows
Fishtail’s experimental analogue CV file packages deserve attention because they show how far the app’s routing concept goes. The official site lists experimental analogue CV file packages under interchange, and the User Guide says each selected part can produce 48 kHz, 24-bit mono Pitch WAV and Gate WAV files, with optional Clock data in its own WAV. The ZIP also contains calibration, tuning, MIDI, and manifest information.
This will not be the first feature every user tries. Many producers will stay in AUM, Logic Pro, AUv3 routing, CoreMIDI, or Standard MIDI export. Still, the CV export idea matters because it places Fishtail near modular and hardware-adjacent workflows. A generative composition can become control-voltage material rather than staying inside a plugin host.
That is an unusual bridge: iPhone/iPad/Mac generative composition on one side, pitch and gate files for analogue-style systems on the other. It also reinforces Fishtail’s identity as a composition system rather than a simple melody generator.
For experimental producers, this feature could turn generated forms into control material for modular recordings, hardware layers, or sample-based CV playback experiments.
How Privacy And Local Design Fit The Tool’s Philosophy
Fishtail’s privacy posture matters because current music tools increasingly involve accounts, cloud services, analytics, subscriptions, and AI model pipelines. The official site says Fishtail has no user accounts, advertising, analytics, or tracking, and that its current privacy manifests declare no data collection by the app or AUv3 extension. The App Store listing also states that the developer does not collect data from the app.
That local-first design supports the creative philosophy. Fishtail generates MIDI on device through algorithmic rules rather than sending prompts, audio, or project details to a cloud model. Projects, preferences, and exports remain handled on-device or through files and sharing actions the user chooses.
For producers concerned about privacy, ownership, or cloud dependency, this distinction matters. Fishtail is not positioned as a service that needs user data to function. It is an app and plugin system that can generate, route, save, and export locally.
This does not automatically make it better than every cloud tool, but it makes the tradeoff clearer. Producers who want a self-contained generative composition system can understand what the app does and does not collect.
Why Fishtail Feels Like Rule-Based Composition, Not Prompting
The clearest difference between Fishtail and prompt-based AI lies in how the user works. A prompt asks for an outcome. Fishtail asks for a structure. The user chooses sections, keys, modes, meters, cadences, compositional method, voice layout, breathing, density, rhythm motion, expression, Bloom pressure, intonation, output mode, routing, and export format.
That workflow keeps musical decision-making visible. The producer can decide whether a section uses 7/8, whether a cadence feels modal, whether Bloom activity should increase, whether a take should hand off at a whole-piece boundary, whether the generated material should route to one instrument or seven, and whether the tuning should use equal temperament, just ratios, Pythagorean tuning, Werckmeister III, or another available system.
Prompting can produce results quickly, but it often hides why the result happened. Fishtail produces results through controls that point back to musical concepts. The user may not know every internal rule, but the interface language remains compositional.
That makes the app especially interesting for producers who want generative help without losing the habit of thinking like an arranger.
How Producers Can Use Fishtail In A Real Session
Fishtail will work best when producers decide what role it should play before generating endlessly. It can create complete forms, but a track still needs sound selection, editing, arrangement judgment, and mix direction. Treat Fishtail as a composition partner, not an automatic release machine.
A practical workflow could look like this:
- Start in AUM, Logic Pro, or the standalone Mac app with one simple receiving instrument on the combined output.
- Generate a short form, then listen for contour, cadence, density, and register rather than judging the sound too early.
- Route the seven parts to separate instruments once the musical behavior feels promising.
- Retain strong takes instead of overwriting them through constant regeneration.
- Use Intonation and Output settings only after confirming the receiver can express the chosen tuning.
- Export Standard MIDI when the generated form needs detailed DAW editing.
- Save the .fishtail project so the musical recipe and retained material remain available.
This workflow protects the best part of generative composition: discovery. It also keeps the producer in charge. Fishtail can propose form, movement, and voice relationships, but the track becomes finished only when the producer selects, routes, edits, sounds, processes, and mixes the material.
What Producers Should Watch Before Buying
Fishtail looks powerful, but producers should understand its platform and routing limits. KVR lists Mac support as macOS 14.0 or later, universal for Apple silicon and Intel Macs, while iPhone and iPad require iOS or iPadOS 17.0 or later. The App Store lists Fishtail at $4.99 for iPhone and iPad during the introductory window, and KVR lists $14.99 introductory pricing for Mac through September 9, 2026.
The most important limitation is simple: Fishtail does not make sound by itself. A receiving MIDI instrument is required. Producers who expect a complete synth or one-button audio generator may misunderstand the tool. Fishtail supplies MIDI and composition structure. The user supplies instruments, routing, and production taste.
Host MIDI routing also matters. The official site says the Mac version works as an AUv3 instrument in Logic Pro or as a standalone app that publishes CoreMIDI sources. The iPhone and iPad version works standalone or as an AUv3 MIDI plug-in and has been tested in AUM. Other hosts may vary based on their MIDI-routing capabilities.
The best buyer is someone who enjoys generative structure, MIDI routing, multi-part composition, microtonality, and hands-on arrangement.
Why Fishtail Makes Generative MIDI Feel More Like Composition
Amy Nicola McBride Fishtail makes generative MIDI feel more like composition than AI prompting because it focuses on musical structure instead of text-driven output. It gives producers sections, keys, modes, meters, cadences, compositional methods, voices, routing, retained takes, whole-piece handoffs, tuning systems, MPE and pitch-bend output, Ableton Link, CoreMIDI sources, Standard MIDI export, .fishtail project recall, and experimental CV packages.
For RobSonic readers, the practical value is clear. Fishtail can help generate complete, repeatable, multi-section MIDI pieces while leaving the sound, instruments, arrangement edits, effects, and mix identity to the producer. It offers surprise without pretending that surprise equals finished music. It offers structure without hiding every decision behind a prompt.
That is why Fishtail feels important in 2026. It gives generative music a different path from AI prompting. The producer does not ask a model to make a track. The producer sets musical conditions, generates takes, retains strong forms, routes voices, shapes tuning, exports MIDI, and finishes the result through real production choices. That workflow makes generative MIDI feel less like outsourcing and more like composition.