Tempra — Metronome

Tempra is an offline music metronome utility engineered for musicians, drummers, and practice sessions. The application generates sample-accurate rhythmic pulses directly within the low-latency audio buffer to prevent timing drift.

Tempra computes each click directly as an integer sample position in the audio buffer from the rational value round(n * 60 * 48000 / BPM). The mathematical remainder resets on every beat to eliminate cumulative drift during long practice routines.

Key Features:

1. Audio Clock Synchronization
The visual pendulum is synchronized directly with audio playback buffer positions, maintaining precise alignment between visual motion and acoustic output.

2. Real-Time Audio Synthesis
All click sounds are synthesized dynamically at runtime using exponential envelope decay across four acoustic voices: Wood Block, Rim Shot, Pure Sine Beep, and Clave. Accented beats are pitched up a musical fifth (x 1.5) without loading external sound files.

3. Odd Meters and Complex Time Signatures
Full support for asymmetric meter groupings, including 7/8 (grouped as 2+2+3 or 3+2+2), 5/4 (3+2 or 2+3), and compound meters (6/8, 9/8, 12/8) with weighted dotted-quarter pulses.

4. Polyrhythm Engine
Configure dual-ratio cross-rhythms (3:2, 4:3, 3:4, 5:4, 7:4) aligned on a unified sample grid. The two pulse streams coincide accurately on downbeats. Displays both a concentric dual wheel and a linear timeline.

5. Tempo Trainer and Bar Drop
Set gradual tempo ramps across user-defined BPM ranges and measure intervals. Includes measure muting (Bar-Drop) and random beat muting to test internal rhythm stability.

6. Structured Practice Setlists
Organize performance setlists with custom song structures, measure counts, and tempo transition profiles.

7. Tap Tempo Detection
Hardware touch timestamp capture with outlier filtering, providing unrounded BPM calculation, interval history, and millisecond stability analysis.

8. 16-Step Accent Pattern Grid
Customize rhythmic accents across 16 subdivisions with four velocity levels (Muted, Normal, Medium, Accent). Practice duration is tracked locally on-device.

Privacy and Device Integrity:
• 100% Free with zero advertisements and zero in-app purchases.
• Zero Android permissions requested in the application manifest.
• Completely offline operation with no network connections or telemetry.
• Practice logs and user presets remain strictly on your local device storage.