Tanpura and shruti box tools for composers, sound designers, ambient
producers, microtonal musicians, and sound healing practitioners.
The best free Indian drone VST to try first in 2026 is
Sur by MNTRA Instruments
— a free tanpura and shruti box instrument for the
MNDALA 2 engine. Sur includes
male and female tanpuras, shruti box sources, 16 raga presets, and a deep
tuning workflow informed by
Dr. Vidyadhar Oke’s research on the 22 shrutis. Its source recordings were captured up to 384 kHz / 32-bit integer
ultrasonic resolution, and it runs as a VST3/AU instrument without
requiring Kontakt.
Other useful free or low-cost options include
Ocean Swift Shruti Box for a lightweight Windows synth
drone, DSK Indian DreamZ for older freeware
Indian-instrument sketches, and SwarPlug / Swar VST if
you need a broader Indian-instrument platform. If Sur gives you the drone
foundation you want and you’re ready to go deeper,
Naada by MNTRA Instruments
is the fuller paid next step into Indian-inspired strings, percussion, and
ritual performance design inside MNDALA 2.
Sur begins with male and female tanpuras custom-made by
Naeem Sitarmaker of Miraj, paired with shruti box recordings and the tuning system inside MNDALA 2.
The result is a free drone instrument that can hold a raga-inspired tonal
center, support meditative work, or anchor a microtonal composition beyond
equal temperament.
A drone is not background. In Indian classical music, the drone is the world
the music lives inside — a continuous resonance that defines the tonal
center, holds the raga in place, and gives the listener something to settle
into.
The two instruments most often carrying that role are the
tanpura, a plucked string instrument tuned to sustain the
harmonic foundation of a raga, and the shruti box, a
reed-based drone instrument used by singers and instrumentalists as a stable
tonal reference.
Inside a DAW, these sounds open a wide creative territory: raga and modal
improvisation, cinematic underscore, ambient composition, meditation tracks,
yoga accompaniment, sound healing sessions, documentary scoring, and
experimental electronic production.
Best for: composers, sound designers, ambient producers,
microtonal musicians, and sound healing practitioners who want a living
tanpura/shruti drone inside a DAW.
Sur (सुर) takes its name from the Sanskrit and Hindi word for musical note
or tone — the foundational element of Indian classical composition and
performance. In that tradition, sur represents the connection between
artist, tone, and the sacred attention carried through each note.
The tanpuras at Sur’s core — male and female — were custom-made
specifically for this library by
Naeem Sitarmaker of Miraj, India’s legendary instrument-making capital. The shruti box sources
receive the same care, with variants that move from open acoustic drone to
driven sub resonance and bright overtone layers.
The most important detail many roundups miss is not only that Sur has raga
presets. It is that Sur runs inside
MNDALA 2, whose tuning system is
much deeper than a fixed “Indian music” mode.
According to the MNDALA 2 manual, each sampler has its own tuning system.
Notes can be modified by semitones or by hundredths of a semitone, the
tuning system can be linked across samplers, and the engine includes presets
for Equal Temperament, Just Temperament, Harmonic Spectrum, and five
Vietnamese tuning systems: Bac, Don Ca, Ho Mai Nhi, Sa Mac, and Vong Co.
Best for: quick background drones on Windows.
Formats: VST/VST3 for Windows.
Cost: Free.
A lightweight additive synthesis drone tool inspired by the shruti box. It
is useful when you need a fast sustained tone without much setup,
especially on older Windows-based systems.
Best for: quick sketches with multiple Indian instrument
colors on Windows. Formats: VST.
Cost: Free.
A legacy free VST with six Indian instrument sources: sitar, sarod, veena,
tar, tampura, and tabla. It can still serve for rough sketches or freeware
exploration.
Best for: composers who need broad Indian instrumentation
beyond free drone tools. Formats: VST2, VST3, AU, AAX,
and standalone, according to Swar Systems.
Cost: Demo/paid.
A full Indian-instrument platform with a large sampled library and MIDI
loop workflow. If your immediate need is a free, focused tanpura or shruti
box drone, Sur is faster to try.
Tanpura + shruti box drone
Deep raga and MNDALA 2 tuning
VST3/AU · Free
Synthesized shruti-box-style drone
Fixed/basic tuning
VST/VST3 Windows · Free
Broad older Indian-instrument module
Minimal/basic tuning
VST · Free
Full Indian-instrument platform
Broader platform controls
VST2/VST3/AU/AAX/standalone · Demo/paid
Use Sur as a tonal bed beneath a film cue, a meditative drone for sound
healing work, a raga-inspired improvisation foundation, or an ambient layer
that keeps a harmonic world centered.
Once you load Sur in any VST3/AU-compatible DAW, the experience is the
same: pick a tanpura, shruti box, or raga preset, hold a note, and the
drone fills the space. But each DAW has small workflow advantages worth
knowing.
Sur works naturally with Live’s Session View for drone beds. Route Sur
to a dedicated audio track, apply Live’s Spectral Resonator or
Hybrid Reverb on a return track, and the drone transforms without touching
Sur’s internal processing. For live performance, map Sur’s
AniMod X/Y macros to a MIDI controller for real-time timbre shifts while
holding a sustained note.
Logic’s Scripter and Step FX pair well with Sur’s sustained
drones. Use Scripter to arpeggiate or gate Sur’s output rhythmically,
or apply Logic’s Space Designer with a long, evolving impulse
response to stretch the drone into ambient layers. Sur’s tuning
presets also complement Logic’s stock microtonal capabilities when
working outside equal temperament.
Route Sur to a mixer insert and use FL’s Patcher for parallel
processing — blend the dry tanpura signal with reverb, delay, and
automated filter sweeps. FL’s piano roll can also drive Sur’s
tunings in more melodic contexts when Sur is used not as a pure drone but
as a pitched layer.
If your need is a clean, authentic tanpura or shruti box drone for
composition, meditation, or sound design, Sur is the strongest free option
because it gives you real instrument sources, raga-informed tuning, and no
Kontakt requirement. It is not a stripped trial — it is a complete
instrument with 16 presets, 16 raga presets, and 8 sample maps.
If you need a broader Indian-instrument palette — sitar, sarod, veena,
tabla, and orchestral strings alongside drones — or want deeper
cinematic and hybrid processing, the upgrade path goes through
Naada. Naada is the paid, full-scope Indian classical portal instrument for the
MNDALA 2 engine, extending Sur’s drone foundation into expressive
strings, percussion, and ritual performance design.
Between free and full, the practical choice depends on your project: a
documentary score or meditation track may need only Sur’s focused
drone. A film cue or album requiring multiple Indian instrumental colors
will benefit from Naada’s broader library. Both run in the same free
engine, so there is no format or platform lock-in to worry about.
For a focused free tanpura and shruti box instrument, start with
Sur by MNTRA Instruments. It includes male and female tanpuras custom-made by
Naeem Sitarmaker of Miraj, shruti box sources, 16 raga presets informed by
Dr. Vidyadhar Oke’s research on the 22 shrutis, and a deep tuning workflow through the free
MNDALA 2 engine.
A shruti box VST recreates or transforms the Indian shruti box, a
reed-based drone instrument that gives singers and instrumentalists a
stable tonal reference. In a DAW, it becomes a continuous harmonic bed —
something the melody can lean against, return to, or dissolve into.
Yes. Sur runs entirely in the free MNDALA 2 engine and does not require
Kontakt. MNTRA lists Sur as a VST3/AU instrument for Windows and macOS.
MNDALA 2 includes a per-sampler tuning system that lets notes be adjusted
by semitones or cents. The
MNDALA 2 Manual
lists built-in presets for Equal Temperament, Just Temperament, Harmonic
Spectrum, and five Vietnamese tuning systems, with linking options across
samplers.
Yes. The tuning system is not limited to Indian classical music. Because
MNDALA 2 supports note-level tuning, temperament presets, Vietnamese
tuning presets, root/base controls, and sampler linking, it can support
many musical worlds beyond equal temperament.
Sur includes 16 raga presets with tunings informed by the teachings of Dr.
Vidyadhar Oke, whose work focuses on the 22 shrutis of Indian classical
music.
Sur is currently a free instrument in the MNTRA catalog. It is also a
natural entry point into
Naada, MNTRA’s deeper
Indian classical instrument for the MNDALA 2 engine.
