Three-Body Tech World in Gourd

Chinese Hulusi Virtual Instruments

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  • Regular price $59.00
    Digital Product - Delivered via Email.
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Apple Silicon Compatible
AAX Native - Compatible with Pro Tools 11 and above
AudioUnits Format VST2 Format
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Hulusi is a clarinet-like instrument in southern China, and it is especially favored by Dai, Yi, and Miao ethnic minorities.

It has a bamboo wind tube and gourd resonance chamber, with two auxiliary wind tubes play two fixed notes for harmonics.

Due to the mellifluous and lovely sound of Hulusi, it is massively used to express romantic relationships and accompaniment for lyrical dance.

Adjustable Sound Field

When samples were recorded, 5 different microphones were used with different positions to capture the spatial and reverb characteristics of Hulusi.

All these channels were mixed down to four channels: Yin, Yang, and far stereo.

The volumes of these four channels were adjustable in software, making it possible to obtain various tones.


By controlling airflow and finger, Hulusi has a very rich set of performances such as mordent, finger pole popping, trill, flutter, vibrato, staccato, and gliss.

All these performances can be triggered in World in Gourd software, making it most adjustable Hulusi virtual instrument.

Realistic Expressions

World in Gourd has real-recorded expressions that are freely controllable. With the control of MIDI CC, it can express tone changes like a real Hulusi performance.


With three different speeds of real-recorded gliss samples and sample synthesis technique, World in Gourd can perform gliss at freely adjustable speed.

Vibrato Engine

Real-sample-based LFO engine making World in Gourd performs vibrato that is both realistic and adjustable.

Sampling Engine

Self-developed sampling engine with better sound quality, more powerful disk buffer streaming/sampling compression technology, and brand-new sound fusion technology.


We recorded the sound between legato notes at two speeds, and apply them according to the playing speed in the software.

In addition, we recorded "regular legato", "fast legato", and "popping legato" which are specific in Chinese Hulusi.


You can switch between bass, alto, or treble Hulusi to have different tunings.


Sounds from the two harmony tubes were recorded into triggerable samples.

Spectrum Fusion Legato Technology

Real-recorded legato samples can enhance the realism of legato instruments, but the conjugate part by naive cross-fade algorithm of two samples would induce phase-cancellation problems.

In order to better cohesive legato performance, we developed the "spectrum fusion legato" technology.

When necessary, frequency domain fusion is used instead of time-domain cross-fade to create transition parts between samples, which improves the smoothness of the connection.

Convolution Reverb

At the beginning of Chinese Traditional series development, we started to record the convolution reverb samples from spectacular places, famous natural and historical heritages in China. Thus you can simulate World in Gourd being played at the Great Wall or Terracotta Army site.

Effect Rack

A Compressor, EQ, Chorus, and Ping-Pong delay are included, allowing you to create more flexible sounds.

Pattern Library

Complete pattern library, with rich preset of patterns that can be updated in the future. And you can add your own pattern by dragging MIDI clips inside.

System Requirements

  • MacOS 10.9 Mavericks and above
  • Windows 7 and above (32 and 64-bit)
  • Intel, AMD, or Apple Silicon CPU
  • 4GB RAM or more
  • 2GB free storage space

Plugin Formats

AAX Native, AU, VST2

User Manual