Strum Roll by LDM Design

Overview & The Guitar Chord Problem

Strum Roll solves a fundamental problem for producers programming guitar parts in Ableton Live – translating guitar chord voicings into piano roll MIDI is tedious, error-prone, and disconnected from how guitarists think about chords. Guitar chord diagrams are everywhere online showing finger positions on frets and strings, but converting these visual representations into piano roll notes requires transposing each string’s pitch individually while accounting for open strings, alternate tunings, and proper voicing intervals. Strum Roll provides a guitar fretboard GUI where you click directly on frets to program chords exactly as they appear in guitar diagrams, then adds realistic strumming articulation with adjustable timing, velocity randomization, and up/down strum directions.

The device features a visual guitar neck displaying the 3rd, 5th, 7th, 9th, and 12th fret markers. Click any fret position on any string to activate that note. Click and drag horizontally across multiple strings to set bar chords. The darker section on the left represents open strings (unfretted). Strings without any fret clicked remain silent. Store up to 8 different chord voicings, accessible via numbered buttons on the right. Arrow buttons trigger upstrokes (low to high strings) or downstrokes (high to low strings) with adjustable strum time determining the delay between each string sounding.

This workflow matches how guitarists conceptualize chords – as physical shapes on the fretboard rather than abstract pitch collections. Find any guitar chord online (there are thousands of free chord diagram resources), look at the fret positions, click those positions in Strum Roll, and the chord plays correctly voiced with proper string intervals. No mental translation required. No piano roll transposition. No counting semitones between strings. The fretboard GUI is the interface. Combined with strumming articulation controls, the device generates guitar-like performances from simple MIDI triggers, working equally well with sampled guitar instruments, synthesizers, or any sound source.

Fretboard GUI and Chord Programming

The fretboard display shows six horizontal strings (standard guitar tuning by default) with vertical fret positions marked. Click any intersection point to activate that note. The visual feedback is immediate – clicked positions light up showing which notes are active in the current chord. To program a simple C major chord in standard tuning, click the open (dark) section on the A string (5th string), third fret on the D string (4th string), second fret on the G string (3rd string), open on the B string (2nd string), and first fret on the high E string (1st string). The chord is now programmed exactly as it appears in guitar diagrams found online or in chord books.

Bar chords – where one finger frets multiple strings at the same fret – are equally simple. Click and drag horizontally across strings at any fret position to activate multiple notes simultaneously. For an F major bar chord, click-drag across all six strings at the first fret, then add individual notes at higher frets for the full voicing. The interface accommodates partial chords, power chords (root and fifth only), open voicings, and complex jazz chords with equal ease. If a string has no active fret, that string doesn’t play, enabling the dropped strings and selective string choices characteristic of guitar voicings.

Eight chord slots (numbered 1-8 on the right side) store different voicings. Click a number to switch between chords for editing or playback. This enables programming complete chord progressions – slot 1 might be C major, slot 2 is F major, slot 3 is G major, slot 4 is A minor. Cycle through slots while programming to build your progression, then trigger each slot via MIDI notes for sequenced playback. The visual nature makes editing intuitive – see immediately which strings are active, which frets are pressed, and how the voicing will sound before triggering playback.

Strumming Articulation and Timing

Strumming articulation is Strum Roll’s signature feature beyond basic chord programming. Two arrow buttons between the fretboard and chord slots trigger upstrokes and downstrokes. The up arrow plays from lowest string to highest string (like strumming down the neck toward the floor). The down arrow plays from highest string to lowest string (like strumming up toward the ceiling). This mirrors real guitar technique where downstrokes and upstrokes produce slightly different timbral characteristics and rhythmic feels.

Strum Time controls the millisecond delay between each successive string sounding. Set to 0ms, all strings trigger simultaneously as a block chord. Increase to 10ms, and the chord rolls across strings with 10-millisecond spacing, creating the characteristic strum sound where notes don’t attack precisely together. A full six-string chord with 10ms strum time takes 50ms total to complete (5 intervals between 6 strings). Higher values (20-30ms) produce more pronounced, deliberate strums. Lower values (5-10ms) create tight, fast strums. The timing variation is what makes programmed parts sound like a human strumming rather than a keyboard player hitting multiple keys simultaneously.

Randomize Velocity adds another layer of realism. Enable this parameter and each string’s velocity varies randomly with each strum. Guitar strings don’t all sound at identical volume when strummed – the pick or fingers hit some strings harder than others, emphasis naturally varies, and human performance includes micro-variations impossible to program manually. Randomize Velocity automates this humanization, ensuring repeated chord strums sound organically varied rather than mechanically identical. Combined with strum timing, the result is remarkably realistic guitar articulation from simple button presses.

Alternative Tunings and Octave Control

The Tuning dropdown provides several popular alternative guitar tunings beyond standard tuning (EADGBE from low to high). Drop D tuning lowers the low E string to D, enabling heavier power chords and extended bass range common in metal and hard rock. Open G tuning (DGDGBD) creates a G major chord when all strings ring open, facilitating slide guitar playing and specific blues/folk voicings. Additional tunings accommodate different playing styles and musical contexts, each changing how the fretboard translates to pitch output while maintaining the visual programming interface.

Changing tuning doesn’t require reprogramming chords if you’re working from guitar diagrams – the diagram shows fret positions which remain valid regardless of tuning (assuming the diagram specifies the tuning). A chord shape in Drop D looks identical on the fretboard to standard tuning; the actual pitches produced differ but the visual programming remains the same. This means you can copy chord diagrams directly without worrying about tuning transposition – just match the tuning setting to the diagram’s specified tuning.

Octave control shifts all strings up or down by octaves. This enables using Strum Roll for bass guitar parts (shift down an octave), high-register plucked parts (shift up), or keeping guitar parts in specific frequency ranges to avoid clashing with other instruments. The octave setting affects all strings simultaneously, maintaining proper interval relationships within the chord while transposing the overall pitch center. Combine tuning selection with octave control to access a wide range of guitar-like timbral territories.

MIDI Sequencing and Note Length Articulation

MIDI note triggering enables sequencing strumming patterns in Ableton’s piano roll. The Down and Up parameters at the top assign MIDI note numbers to trigger downstrokes and upstrokes respectively. Set Down to C-2 and Up to C#-2, then create a MIDI clip containing those notes to program a strumming rhythm. Place C-2 notes on downbeats for downstrokes, C#-2 notes on upbeats for upstrokes, and the device plays the currently selected chord with appropriate strum direction and timing.

Note length in the MIDI clip controls a crucial articulation parameter. For the full chord to play with strum time applied, the MIDI note must be long enough for all strings to sound. A chord with 10ms strum time across six strings needs at least 50ms note length to complete. Shorten the MIDI note length below this threshold and the strum cuts off before all strings sound. This creates rhythmic variation and accents – a staccato sixteenth note might trigger only the first 2-3 strings of a downstroke, while a sustained quarter note lets the full chord ring. Varying note lengths throughout a MIDI pattern produces the rhythmic complexity of real guitar strumming.

This note length technique is particularly effective for creating percussive, rhythmic guitar parts. Program a steady stream of sixteenth notes alternating between downstrokes and upstrokes. Make some notes very short (only 1-2 strings sound) for percussive attack, others longer for fuller chord voicings. The pattern breathes with variation, mimicking how guitarists mute strings, choke chords, and vary pick attack for rhythmic interest. Combined with velocity randomization and strum timing, the result is expressive, human-feeling guitar parts from simple sequenced triggers.

Beyond Guitar: Creative Applications

While designed for guitar-like parts, Strum Roll works with any MIDI instrument. Route it to synthesizers for arpeggiated chord textures where notes don’t attack simultaneously. Use it with mallet instruments (vibes, marimba) for rolled chords mimicking mallet technique. Apply it to string sections for orchestral divisi effects where string players don’t attack perfectly together. The strum timing becomes a creative delay effect, the fretboard GUI becomes a unique chord programming interface, and the up/down strum directions provide two timbral variations of the same chord.

Electronic producers can use Strum Roll for textural chord pads where slight timing offsets between notes create movement and width. The millisecond delays between voices prevent phase cancellation and frequency masking, making chords sound fuller and more spacious. Velocity randomization adds dynamic variation to synthesizer patches that might otherwise sound static. The device transforms simple sustained synth chords into evolving, animated textures through timing and velocity variations alone.

The fretboard metaphor also offers compositional benefits for non-guitarists. Guitar voicings often use specific intervals and voice-leading movements that differ from keyboard-based chord construction. By programming chords on a virtual fretboard, producers access guitar-idiomatic harmonies and movements that might not occur to keyboard players. Drop 2 voicings, open string pedal tones, and close-position triads with doubled notes all emerge naturally from fretboard thinking. Strum Roll becomes a creative constraint that generates musical ideas outside typical keyboard voicing patterns.

Features & Highlights

Visual Fretboard GUI: Click directly on fret positions to program chords exactly as they appear in guitar diagrams.

8 Chord Slots: Store up to 8 different chord voicings for quick access during programming and performance.

Realistic Strumming Articulation: Adjustable strum time creates millisecond delays between strings for authentic strum feel.

Up and Down Strokes: Separate triggers for upstrokes (low to high strings) and downstrokes (high to low strings).

Velocity Randomization: Automatic velocity variation per string for humanized, organic performances.

Alternative Tunings: Drop D, Open G, and other popular guitar tunings for style-specific voicings.

Octave Control: Transpose entire fretboard up or down by octaves for bass or high-register parts.

MIDI Note Triggering: Assign specific MIDI notes to trigger downstrokes and upstrokes for sequencing in piano roll.

Note Length Articulation: Control how many strings sound by varying MIDI note length for rhythmic variation.

Note Display Mode: Optionally display note names on fretboard for learning and verification.

Universal Instrument Compatibility: Works with guitar samples, synthesizers, or any MIDI instrument.

Ideal For

• Producers programming guitar parts who don’t play guitar
• Guitarists who want to quickly translate chord shapes into MIDI
• Anyone tired of manually transposing guitar chords into piano roll
• Musicians seeking realistic strumming articulation for sampled guitars
• Electronic producers wanting unique chord textures from timing offsets
• Composers accessing guitar-idiomatic voicings and movements
• Sound designers applying strum timing to non-guitar instruments creatively

What’s Included

• Strum Roll MaxforLive MIDI Device (.amxd)
• Guitar fretboard GUI with 8 chord slots
• Adjustable strum timing (0-30ms+ delay between strings)
• Alternative tuning presets (Drop D, Open G, and more)
• Velocity randomization for humanization
• MIDI note assignment for up/down stroke triggering
• Octave control for pitch range adjustment
• Note display mode for visual feedback
• Comprehensive PDF user manual
• Compatible with Mac and Windows
• Requires Ableton Live 10/11/12 Standard (with MaxforLive) or Suite

Technical Notes

Strum Roll is a MaxforLive MIDI device (.amxd file) requiring Ableton Live Standard with MaxforLive installed or Ableton Live Suite. The device processes MIDI note triggers and outputs chords with timed articulation. Strum time determines millisecond delays between successive strings – total chord duration equals strum time multiplied by the number of active string intervals. For example, a 6-string chord with 10ms strum time takes 50ms to complete (5 intervals between 6 strings). MIDI note length must exceed total strum duration for all strings to sound. Shorter MIDI notes create partial chords where only initial strings trigger before the note-off message arrives.

The device outputs standard MIDI note data, compatible with any MIDI instrument in Ableton Live including software instruments, hardware synthesizers (via MIDI routing), and external samplers. Velocity randomization applies independent random variation to each string’s velocity on every strum, within a range preserving the overall dynamic level. Alternative tunings change the pitch output for each string while maintaining the visual fretboard interface. The device includes standard guitar tuning (EADGBE), Drop D, Open G, and additional tunings common in various musical styles.

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