Tempo, delay & sample timing lab
A practical music technology lesson that turns BPM into note durations, delay settings and sample frames. The printable package includes a teacher guide, student worksheet and complete answer key.
This page is the accessible HTML version. For student handouts, print pages 2–3 of the PDF; pages 4–5 contain the teacher answer key.
- Level
- Grades 8–12 + introductory college
- Time
- 30–45 minutes
- Format
- Individual or pairs
- Cost
- Free, no account required
What students will be able to do
- Calculate straight, dotted and triplet note durations from BPM with at least 80% accuracy.
- Apply note values to a tempo-synchronized delay setting and explain the rhythmic relationship.
- Calculate audio duration or sample-frame count from a sample rate with at least 80% accuracy.
Accuracy conventions: BPM represents quarter-note beats. A triplet is two thirds of its matching straight note. One sample frame contains one sample value for each channel. Keep full precision and round only the final repeating millisecond value to 0.01 ms.
A flexible 30–45 minute lesson
Students only need a calculator, the worksheet and web access. A DAW or delay plug-in is useful for the extension but is not required.
- 0–5 min
Hear and estimate
Compare teacher-led pulses at 60 and 120 BPM, then ask what happens to the time between beats when BPM doubles.
- 5–12 min
Model the math
Derive one quarter note with 60,000 ÷ BPM, then multiply to find straight, dotted and triplet values.
- 12–25 min
Complete the worksheet
Students solve tempo and note-duration questions individually or in pairs and show their working.
- 25–35 min
Apply the results
Use the delay and sample calculators to check answers and connect each calculation to a studio task.
- 35–45 min
Review and reflect
Discuss rounding, compare subdivisions, and complete the reflection prompt or an optional DAW extension.
30-minute version: Assign Questions 1–5, 7, 8, 10 and 12, then use the final minutes to correct one error and explain it.
12 timing problems
Ask students to show formulas and units. Accept sensible rounding where requested, then verify the results with the linked tools.
- At 120 BPM, how long is one quarter note in milliseconds?
- At 100 BPM, calculate the duration of an eighth note and a sixteenth note.
- At 128 BPM, how long is an eighth note? Give the exact value before rounding.
- At 128 BPM, calculate a dotted-eighth-note delay.
- At 128 BPM, calculate an eighth-note triplet.
- At 90 BPM, calculate a quarter note, dotted quarter and quarter-note triplet. Order them shortest to longest.
- A track is 120 BPM. What delay time creates a dotted-eighth-note echo?
- At 96 BPM, calculate a dotted-eighth delay and an eighth-note-triplet delay. Which repeats first?
- A quarter-note delay is set to 480 ms. What tempo does it match?
- How long is 44,100 sample frames at a 44.1 kHz sample rate?
- How long is 96,000 sample frames at a 48 kHz sample rate?
- At 120 BPM in 4/4, find the duration of four bars and the sample-frame count at 48 kHz.
Teacher answer key
- 500 ms
- Eighth: 300 ms; sixteenth: 150 ms
- 234.375 ms
- 351.5625 ms
- 156.25 ms
- Quarter: 666.67 ms; dotted quarter: 1,000 ms; quarter triplet: 444.44 ms. Order: triplet, straight, dotted.
- 375 ms
- Dotted eighth: 468.75 ms; eighth triplet: 208.33 ms. The triplet repeats first.
- 125 BPM
- 1 second
- 2 seconds
- 8 seconds and 384,000 sample frames, containing 384,000 sample values in each channel
Adapt it to your classroom
Quick assessment
Objective 1 requires 5 of Questions 1–6 correct. Objectives 2 and 3 each require 2 correct answers in their sections: Questions 7–9 and 10–12. Require formulas, units and reasonable rounding.
Differentiation
Provide the BPM reference chart or pre-fill the quarter-note value for extra support. For an extension, have students automate two contrasting delay subdivisions in a DAW and explain the rhythmic effect.
Check and extend the work
- Tap tempo Measure a pulse without a microphone or upload.
- BPM to milliseconds Explore straight, dotted and triplet values.
- Delay calculator Translate note divisions into effect settings.
- Samples to milliseconds Convert frames and time at common sample rates.
- Sample length calculator Connect tempo, bars, frames and PCM size.
- Accuracy methodology Review formulas, precision and test coverage.
Made to share responsibly
Creative Commons license
The teacher guide, worksheet and answer key are licensed under CC BY 4.0. You may copy and adapt them with attribution to BeatTiming.com. The license does not cover the BeatTiming site software, interface, branding or third-party marks.
AI-use disclosure
This resource was created with generative-AI assistance for organization, wording and candidate practice problems. Every numerical answer was recalculated from the stated formulas and checked by automated tests before publication. BeatTiming publishes the final resource and recommends that teachers review it for their classroom context. Students are not required to use AI.