Siesta Audio · Free tools
Free music tools
The calculators and references I keep open next to the DAW, made into pages that work. Every one runs in your browser, and most of them make a sound so you can check the number by ear.
Online guitar tuner
Tune guitar, bass or ukulele with your mic. Finds the string for you, in standard or drop tunings.
Song key and BPM finder
Drop in a song to get its key, Camelot code and tempo, with harmonic mixing matches.
LUFS meter
Integrated loudness, true peak and loudness range, and what Spotify, Apple Music and YouTube will do to your master.
Chord finder
Click notes on a piano to name any chord or slash chord, or build a chord and hear it.
Online tone generator
Any frequency, sweeps, and white, pink and brown noise. Test speakers, subs and left and right.
Online metronome
Tap tempo, accents, subdivisions, odd time signatures and a speed trainer. Keeps time in the background.
Delay time calculator
BPM to milliseconds for every note value, dotted and triplet, with tap tempo and a click to hear the echo.
Reverb pre-delay and decay calculator
Tempo-synced pre-delay and decay times, so the tail breathes with the song. Plus distance to milliseconds.
Frequency to note converter
Any Hz to the nearest note and how many cents off, any note to Hz, and the full note frequency chart.
Tunings chart and reference pitch
22 guitar and bass tunings you can hear, from drop D to drop A, plus A440, A432 or any reference as a tone.
Audio file size calculator
Sample rate, bit depth, channels and length to WAV size and bitrate. Hours per drive, and the 4 GB WAV limit.
EQ frequency chart
The bands, what lives in each, and instrument ranges. Sweep a boost through them and hear the chart.
Plugins you can play in the browser
Every Siesta plugin page has a live sketch of the plugin built on Web Audio. Turn the real knobs on a built-in loop, drop in your own file, or plug your guitar in and play through it.
Adrift
Shoegaze reverb. HEAT, MELT and FREEZE. Play it with a built-in loop, your own file, or your instrument.
Drown
Doom fuzz with an octave-below sub. Play it with a built-in loop, your own file, or your instrument.
La Bestia
One bass, split into a bass rig and a guitar rig. Play it with a built-in loop, your own file, or your instrument.
Memory Station '03
Free lo-fi: tape haze, static, wobble, slowed. Play it with a built-in loop, your own file, or your instrument.
The numbers, at a glance
| Standard guitar tuning | E2 A2 D3 G3 B3 E4 |
| Andante / Allegro | 76–108 / 120–156 BPM |
| Quarter note at 120 BPM | 500 ms |
| Dotted eighth at 120 BPM | 375 ms |
| 1/64 pre-delay at 120 BPM | 31.25 ms |
| A4 | 440 Hz |
| Middle C (C4) | 261.63 Hz |
| Guitar low E (E2) | 82.41 Hz |
| Bass low E (E1) | 41.20 Hz |
| A432 vs A440 | -31.77 cents |
| 1 min, 44.1 kHz / 16-bit stereo | 10.58 MB |
| 1 min, 48 kHz / 24-bit stereo | 17.28 MB |
| Speed of sound, 20 °C | 343 m/s · 1 ms ≈ 34 cm |
| Mud lives around | 200–500 Hz |
| Spotify / Apple Music reference | −14 / −16 LUFS |
| C major / A minor in Camelot | 8B / 8A |