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BPM to Delay Timeの包括的な教育ガイドを準備中です。ステップバイステップの解説、数式、実例、専門家のヒントをお届けしますので、もうしばらくお待ちください。
The BPM to Delay Time Converter computes millisecond delays for every note duration at a given song tempo — essential for setting tempo-synced delay, reverb, gate, sidechain, and LFO modulation effects in DAWs (Ableton Live, Logic Pro, FL Studio, Cubase, Pro Tools, Studio One, Bitwig). Formula: Quarter Note ms = 60,000 / BPM. From quarter note, derive all subdivisions: whole = quarter × 4, half = quarter × 2, eighth = quarter / 2, sixteenth = quarter / 4, dotted = base × 1.5, triplet = base × 2/3. At 120 BPM (very common tempo): Whole note 2000ms, Half 1000ms, Quarter 500ms, Eighth 250ms, Sixteenth 125ms, Dotted Quarter 750ms, Quarter Triplet 333ms, Eighth Triplet 167ms. These exact values create rhythmic delay patterns that lock to the beat. Setting delay time to 500ms at 120 BPM creates a quarter-note echo; setting to 750ms (dotted quarter) creates the classic 'pull' rhythmic delay heard in The Edge's guitar work and many dub/reggae productions. Why dotted and triplet matter: musical timing isn't just straight subdivisions. Dotted notes (1.5× the base) create a swung, lazy feel. Triplets (3 notes in the time of 2) create a rolling 'three feel' against straight rhythm. The most common rhythmic delays in popular music: dotted eighth (rolling lead vocals, Edge guitar), eighth triplet (drum loop variation), dotted quarter (epic rock guitar). DAWs usually offer these as preset options labeled 'D' or 'T' on delay time controls. Producer workflow: Set delay time to musical note value (1/4 or 1/8D) rather than free-floating ms — this ensures the effect locks to song tempo even if tempo changes during production. When playing live or rendering tempo automation, milliseconds drift; note-value delays stay synced. Modern DAWs handle this automatically when you select '1/4' instead of '500 ms' on delay plugins. Calculator output most useful for hardware effects pedals or plugins without tempo sync, where you manually dial in millisecond values.
Quarter Note (ms) = 60000 / BPM; Subdivisions derived from quarter (× 4, × 2, ÷ 2, ÷ 4 for whole/half/eighth/sixteenth)
- 1Step 1 — Enter your song's BPM (most modern DAWs display tempo prominently)
- 2Step 2 — Calculator computes quarter note: 60,000 / BPM
- 3Step 3 — Derives all subdivisions: whole = ×4, half = ×2, eighth = ÷2, sixteenth = ÷4
- 4Step 4 — Derives dotted variants: base × 1.5
- 5Step 5 — Derives triplet variants: base × 2/3
- 6Step 6 — Output displays all common subdivisions in milliseconds
- 7Step 7 — Use in delay/reverb/gate plugins or hardware effects that don't auto-sync to tempo
Most common production tempo. Quarter-note delay creates standard echo; dotted eighth creates rolling rhythmic feel.
Slower tempo creates spacious, deliberate delay textures
Slow tempos forgive longer delay times. Quarter delay at 800ms creates very long, dub-style echoes.
Fast electronic music. Short delay times create tight, percussive rhythmic effects.
Slow cinematic scoring tempo. Long delays create ambient, evolving textures common in film scores.
Setting tempo-synced delay in DAW
Configuring hardware delay pedals without tempo sync
Designing reverb pre-delay timing
Setting sidechain compression timing
Mixing tempo-synced LFO modulation
Live performance pedal/effect setup
Why use musical note values instead of just milliseconds?
Note values stay synced to tempo automatically. If you set delay to 500ms at 120 BPM, then automate tempo up to 140 BPM, the delay no longer matches the beat (500ms is no longer a quarter note at 140 BPM). Setting delay to '1/4' note value: DAW recalculates ms dynamically as tempo changes. Critical for live performance, tempo automation, and remixing. Hardcoded ms only makes sense when tempo will never change.
What's the difference between dotted and triplet?
Dotted notes: 1.5× the base value. Dotted quarter at 120 BPM = 750ms (1.5 × 500). Creates 'pulled' rhythmic feel — note lands halfway between original beat and next. Triplet notes: 2/3× base value (3 notes in time of 2). Quarter triplet at 120 BPM = 333ms. Creates 'three feel' against straight beat — most heard in jazz, blues swing, and intentional dance music tension. Different musical functions.
Best delay subdivisions for different genres?
Rock/pop lead vocals: dotted eighth (creates the classic 'U2 Edge' or Coldplay rhythmic guitar feel). Dub reggae: quarter or half note delay. House/techno: 1/16 note delay for tight rhythmic patterns. Trap/hip-hop: 1/32 or 1/64 for fast triplet hi-hat rolls. Drum & bass: sixteenth note delay matched to drum pattern. Trial and error within musical context is the best teacher.
Why do my hardware delay pedals not have tempo sync?
Older analog delay pedals (Memory Man, DM-2) predate MIDI/tempo sync. They have time knob in ms. Some have 'tap tempo' that lets you tap-in BPM, others require manual ms calculation. Modern digital pedals (Strymon TimeLine, Eventide H9) include MIDI tempo sync and note-value delays. For older pedals, use this calculator to look up correct ms value for desired subdivision at your song's BPM.
プロのヒント
Try dotted-eighth delay (base eighth × 1.5) on lead guitar or vocal — produces the classic 'U2 Edge' or modern indie sound. At 120 BPM that's 375 ms. The dotted timing creates a 'pull' that's more rhythmic than straight eighth notes. Set feedback around 30–40% and high-cut filter for the most usable mix.