Esraj Tuner

Online Esraj Tuner: The Complete Guide

The esraj sits at an interesting crossing point between two families of Indian instruments — it's bowed like a sarangi, but fretted like a sitar, giving it both the sustained, voice-like expressiveness of a bow and the semitone reference points a fretted instrument provides. This tool is built for exactly that combination: set your Sa, then check any main or sympathetic string against the full set of 12 swaras, right in your browser.

How does this esraj tuner work?

This tuner uses the Web Audio API built into modern browsers to capture a short sample of sound from your microphone, then runs it through an autocorrelation algorithm. Autocorrelation compares a sound wave against slightly delayed copies of itself to find the point where the pattern repeats — that repeat rate is the fundamental frequency of the note being played. That frequency is then measured as a number of semitones above or below your chosen Sa, and mapped to the nearest of the twelve swaras.

How to Tune an Esraj Online, Step by Step

1. Choose your Sa. Use the − and + controls to set a comfortable tonic to match your voice or the raga you're preparing to play.
2. Find a quiet space. With a full set of sympathetic strings resonating alongside the main strings, background noise is more noticeable to a pitch detector than on instruments with fewer strings.
3. Tap "Start Tuner" and allow microphone access when your browser asks. This permission is required for any pitch-detection tuner to hear your strings.
4. Bow one open string at a time, letting the note sustain briefly rather than cutting it off immediately.
5. Watch the swara name, saptak (octave), and needle — the tuner shows which of the twelve swaras you're closest to and how many cents sharp or flat you are.
6. Adjust the tuning peg slowly until the reading shows "in tune," then move through the remaining main strings before checking the sympathetic strings.

A Bowed, Fretted Hybrid

Most bowed Indian classical instruments, like the sarangi, are fretless, which means every pitch is placed entirely by the player's finger position with no fixed reference points. The esraj instead has frets, similar to a sitar, giving the player raised metal guides for each semitone along the main strings. Combined with a bow rather than plucking, this lets a player rest a finger against a fret for a stable reference pitch while still using bow pressure and pull-bending across the fret for the smooth glides (meend) more commonly associated with fretless bowed instruments — a genuine hybrid of two distinct playing traditions.

Main and Sympathetic Strings

An esraj typically has around four main playing strings, tuned to a combination of Sa and other reference swaras, bowed to produce the primary melodic line. Alongside them sit a set of sympathetic strings — generally numbering somewhere around 15 to 20, fewer than a sarangi's roughly 35 to 37 but still a substantial number — which resonate freely whenever a main string produces a matching or harmonically related pitch, adding sustain and a soft resonant halo to the sound rather than being played directly.

Understanding Sa: The Movable Tonic

In Hindustani classical music, Sa is the tonic — the reference point every other note is measured against, without a fixed frequency attached to it. A performer chooses a Sa that suits their voice or the raga being performed, and every string on the esraj, main and sympathetic, is tuned relative to that choice. This tool lets you set Sa yourself for exactly that reason.

Esraj vs. Dilruba: A Closely Related Pair

The esraj is closely related to the dilruba, and the two are sometimes used almost interchangeably in conversation, though they're generally distinguished by size and tradition. The dilruba tends to be larger, with a bigger resonating chamber, and is especially associated with Sikh Gurmat Sangeet. The esraj, somewhat smaller, is closely associated with Bengali music and particularly with Rabindra Sangeet, the songs of Rabindranath Tagore. Their tuning approach and this tool's detection method work the same way for both.

Common Esraj Tuning Problems (and How to Fix Them)

The tuner won't detect any sound

This almost always comes down to one of three things: microphone permission was denied, the page isn't loaded over a secure (https) connection, or your input volume is too low. Check your browser's site settings to confirm microphone access is allowed, and make sure no other tab or app is already using the microphone.

Sympathetic strings are confusing the reading

Bowing a main string can set off resonance in several sympathetic strings at once, sometimes producing a wavering reading. Lightly damping the sympathetic strings while tuning a main string, and working through the main strings first, usually resolves this.

Strings won't hold their tuning

Like most instruments strung with a large number of strings under tension, an esraj is sensitive to humidity and temperature changes and will drift somewhat between sessions. Retuning before each practice or performance, rather than expecting the tuning to hold indefinitely, is normal.

Frequently Asked Questions

Pitch detection runs entirely on your device — audio from your microphone is never recorded, stored, or sent to a server.