Every tool, by the decision it owns

• Chords & Harmony

  Name, spell, voice, hear, analyze, or change a chord.

• Scales & Keys

  Identify or build a pitch collection, interval, key, or notation representation.

• Progression & Arranging

  Move, analyze, vary, or arrange a progression.

• Pitch & Tuning

  Tune, compare, map, or calculate pitch behavior.

• Rhythm & Tempo

  Set, understand, perform, or diagnose timing.

• Ear Training

  Hear, locate, read, and reproduce musical material.

• Production & Audio Math

  Convert musical intentions into defensible studio settings.

• Audio Analysis

  Measure or estimate source properties with explicit uncertainty.

• Acoustics

  Estimate and compare room or monitoring choices.

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• Accidental Policy Explorer

  Compare how key context and preference change a note’s spelling, never its pitch.

• Bass Note to Chord Candidates

  Identify chord candidates from a declared bass note plus additional notes.

• Beat Frequency Calculator

  Calculate the acoustic beat rate between two pure frequencies.

• Bit Depth Dynamic Range Explorer

  Compare theoretical ideal quantization dynamic range for PCM bit depths.

• Cadence Finder

  Flag cadence candidates in a parsed progression under a stated key.

• Cadence Variation Generator

  Generate bounded ending alternatives for a stated tonal goal.

• Call and Response Generator

  Generate a short musical call and a related response for imitation or analysis.

• Capo Finder

  Find capo positions and familiar open shapes for a sounding key.

• Capo Fretboard Mapper

  Map open and fretted sounding pitches after a selected capo position.

• Chord Builder

  Build a correctly spelled chord from a tonic and a chosen formula, then hear it.

• Chord Color Tone Explorer

  Add, omit, or alter a chord tension and compare the before/after tone set.

• Chord Function Analyzer

  Explain a declared chord’s likely harmonic function in a supplied key.

• Chord Identifier

  Name the chord (or chords) a set of notes can form, with the evidence behind it.

• Chord Inversion Explorer

  See which chord tone lands in the bass at each inversion.

• Chord Quality Ear Trainer

  Hear a generated chord and identify its quality through a fair local drill.

• Chord Scale Matcher

  Find scale collections that contain a chord and explain altered-tone tradeoffs.

• Chord Spelling Checker

  Audit entered tones against a declared chord symbol and explain every mismatch.

• Chord Substitution Finder

  Compare bounded substitution options for a chord, each with a stated reason.

• Chord Symbol Parser

  Unpack a chord symbol into root, quality, extensions, alterations, and bass.

• Chord Voicing Generator

  Generate explainable playable piano voicings from a chord and range constraint.

• Circle of Fifths Explorer

  Navigate key relationships, signatures, and adjacent fifths.

• Clef Transposition Explorer

  View one pitch across treble, bass, alto, and tenor clef staff positions.

• Common Tone Modulation Finder

  Find shared pitches and chords that can bridge two declared tonal areas.

• Compressor Time Constant Explorer

  Compare attack and release time constants against tempo-derived note windows.

• Count-In Builder

  Configure a bounded audible and visible count-in before an exercise.

• dB Gain Calculator

  Convert an amplitude or power ratio to decibels, or back to a linear ratio.

• Delay Alignment Calculator

  Convert a path-length difference into a time-alignment delay.

• Enharmonic Spelling Resolver

  Select the recommended notation spelling for a pitch class under key context.

• EQ Bandwidth and Q Calculator

  Convert center frequency and octave bandwidth to Q, or Q back to bandwidth.

• Filter Cutoff to Note Explorer

  Map a filter cutoff to its nearest 12-TET note for orientation.

• Frequency to Note

  Find the nearest equal-tempered note and signed cents for a frequency.

• Fret Position Calculator

  Calculate equal-tempered fret distances from the nut and bridge.

• Fretboard Note Explorer

  Find every place a note or scale lives on a guitar or bass fretboard.

• Groove Grid Explorer

  Convert a normalized grid position to milliseconds, with optional swing.

• Guitar Chord Voicing Explorer

  Map a declared chord onto a chosen guitar tuning and fret range.

• Guitar Tuning Explorer

  Inspect open-string pitches, intervals, and range for declared tunings.

• Harmonic Rhythm Planner

  Allocate chord changes across bars and beats under explicit constraints.

• Harmonic Series Explorer

  Inspect and hear integer multiples above a selected fundamental.

• Harmonic Spectrum Explorer

  Inspect ideal harmonic locations and amplitudes for synthetic waveforms.

• Instrument Range Explorer

  Compare documented written and sounding pitch ranges for an instrument profile.

• Instrument Transposition Converter

  Convert written and concert pitches for a declared transposing instrument.

• Interval Ear Trainer

  Hear and identify intervals through a bounded, repeatable local drill.

• Interval Explorer

  Build, hear, and compare a simple or compound interval from a chosen root.

• Interval Identifier

  Name the spelled interval between two notes, including direction and quality.

• Interval Inversion Explorer

  Show the inversion and complement of a named interval.

• Intonation Drift Tracker

  Display a local, user-controlled series of cent deviations over time.

• Just Intonation Ratio Explorer

  Calculate and hear a selected simple-ratio interval relative to a fundamental.

• Key Finder from Notes

  Rank tonal contexts compatible with a selected note set.

• Key Signature Explorer

  See what a key signature means: its accidentals, scale, and relative key.

• Keyboard Note Explorer

  Locate, hear, and practice selected notes on a piano keyboard range.

• Lead Sheet Formatter

  Format chords and lyrics locally into a compact rehearsal layout.

• LFO Tempo Sync Calculator

  Convert BPM and a beat division into an LFO period and rate.

• Listening Position Calculator

  Compare a listening coordinate against room and speaker geometry.

• Measure Duration Calculator

  Calculate the exact duration of one bar or several bars from meter and tempo.

• Melody Harmonization Explorer

  Compare diatonic chord candidates compatible with a melody note.

• Melody Imitation Trainer

  Generate a short bounded melody to imitate by voice or instrument.

• Metronome

  A dependable, editable practice pulse with tempo, meter, accent, and subdivision.

• Microphone Tuner

  A browser-local pitch estimate from your microphone, with an honest confidence band.

• MIDI Note Converter

  Convert a MIDI number to note, octave, and frequency, or convert back.

• Modal Interchange Explorer

  Compare borrowable chord options from a parallel mode sharing the same tonic.

• Mode Comparator

  Compare two modes on one tonic by exactly which degrees change.

• Modulation Planner

  Compare explainable routes between a source and destination key.

• Nashville Number Converter

  Convert a progression to or from Nashville-style degree notation.

• Note Naming Speed Drill

  Practice quickly naming generated notes under a user-controlled timer.

• Note to Frequency

  Calculate the frequency of a stated note under an explicit A4 reference.

• Oscillator Detune Calculator

  Convert a cents detune amount to a frequency ratio and resulting frequency.

• Peak and RMS Meter

  Measure peak and RMS amplitude for a local audio file.

• Phase Delay Calculator

  Calculate phase rotation at a stated frequency from a time offset, or the inverse.

• Piano Chord Voicing Explorer

  Allocate a declared chord between the hands under a chosen voicing family.

• Pitch Bend Calculator

  Convert a cent offset to a normalized MIDI pitch-bend position.

• Pitch Memory Trainer

  Practice retaining one sounded pitch over a controlled delay, then compare.

• Polyrhythm Trainer

  Hear and practice two pulse counts, like 3 against 2, over one shared cycle.

• Practice Timer

  Run a local work-rest practice interval with rounds and audible cues.

• Progression Analyzer

  Summarize a progression’s functions, cadences, and chromatic events.

• Progression Ear Trainer

  Hear a bounded generated harmonic progression and identify its pattern.

• Progression Playback Lab

  Hear an entered, parsed progression with editable tempo, meter, and loop behavior.

• Progression Practice Loop Builder

  Create a tempo-ramped local practice loop for a parsed progression.

• Progression Transposer

  Move a chord progression to another key while preserving its structure.

• Reference Pitch and Cents

  Convert between note and frequency, and calculate cents deviation from a reference.

• Reharmonization Explorer

  Generate bounded alternative chords for one slot under melody constraints.

• Relative and Parallel Key Explorer

  Show a key’s relative (same signature) and parallel (same tonic) counterparts.

• Reverb Time Calculator

  Calculate a tempo-related reverb decay-time starting value.

• Rhythm Dictation Trainer

  Hear a generated rhythm and enter it back as an exact duration sequence.

• Rhythm Ear Trainer

  Hear a bounded rhythm and identify the pattern that was played.

• Rhythm Pattern Generator

  Generate a rhythmic pattern that exactly fills a bar from allowed note values.

• Rhythm Reading Drill

  Generate a graded, readable rhythm exercise from meter and difficulty.

• Roman Numeral Analyzer

  Label a progression with Roman numerals and applied-dominant alternatives.

• Room Mode Calculator

  Predict the axial, tangential, and oblique resonances of a rectangular room.

• Room Treatment Estimator

  Estimate total equivalent absorption needed to reach a target RT60.

• RT60 Estimator

  Estimate idealized Sabine reverberation decay from volume and absorption.

• Sample Rate and Nyquist Explorer

  Calculate the Nyquist frequency for a sample rate and check a test frequency.

• Samples to Milliseconds Calculator

  Convert a sample count to duration or duration to samples at a sample rate.

• Scale Degree Ear Trainer

  Hear a tonic and a scale degree, then identify which degree it was.

• Scale Degree Mapper

  Map notes to scale degrees of a tonic and scale, including alterations.

• Scale Explorer

  Build and play a named scale from any tonic, with degrees, spelling, and mode context.

• Scale Finder

  Rank named scales that contain a selected note set, with ambiguity shown.

• Scale Pattern Generator

  Turn a chosen scale into a bounded, readable practice pattern.

• Schroeder Frequency Calculator

  Estimate the Schroeder transition frequency from room volume and RT60.

• Secondary Dominant Finder

  Construct the applied dominant that resolves to a chosen target chord.

• Sidechain Release Calculator

  Calculate tempo-derived release-time starting values for a rhythmic pulse target.

• Sight Reading Drill Generator

  Generate a short, bounded notation-reading exercise by clef and constraints.

• Silence and Trim Finder

  Identify low-level spans in local audio as candidate trim points.

• Sound Pressure Distance Calculator

  Estimate free-field sound-pressure level change between two distances.

• Speaker Placement Explorer

  Compare symmetric starting positions for a stereo speaker pair.

• Spectral Peak Finder

  Measure prominent spectral peaks in a local audio file’s selected frame.

• Spectrum Viewer

  View a local audio file’s spectral energy at a chosen moment.

• Staff Note Reader

  Practice identifying written notes in a selected clef through bounded prompts.

• String Gauge Change Comparator

  Compare estimated tension for two unit weights at the same length and pitch.

• String Tension Calculator

  Estimate string tension from scale length, frequency, and unit weight.

• Subdivision Trainer

  Practice placing a chosen subdivision against a stable pulse.

• Swing Ratio Explorer

  Compare straight divisions against selectable long-short swing ratios.

• Tap Tempo

  Tap out a tempo and get a working BPM estimate with its consistency evidence.

• Temperament Comparator

  Compare an interval size across 12-TET and a documented just-intonation ratio.

• Tempo Conversion Calculator

  Convert BPM and beat unit into beat, note-value, bar, and frequency durations.

• Tempo Ramp Builder

  Build a finite, editable plan for increasing or decreasing practice tempo.

• Tempo-Synced Delay Calculator

  Calculate a starting delay time in milliseconds for a BPM and note division.

• Time Signature Explorer

  Hear and inspect a meter, its beat grouping, and bar structure.

• Tuplet Calculator

  Calculate the exact duration relationship for a declared tuplet.

• Vocal Range Transposer

  Find key transpositions that fit a melody inside a comfortable vocal range.

• Voice Leading Comparator

  Compare pitch movement between two declared voicings.

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