Helix
SINEfactory instrument—free with registered account

Free string ensemble
Inspiring strings with a full, expressive sound.
Taken from the acclaimed Berlin Series, Helix offers beautiful, playable sustains and spiccatos. Combining solo violins with violas, celli, and basses, this is a detailed and nuanced sound that adds an organic shine to your productions.
Audio demos
Specs and requirements
Runs in Orchestral Tools' free SINEplayer. The latest version is required.
Size
2.8 GB of samples (1.1 GB SINEarc compressed)
24 bit / 48 KHz patches
SINE system requirements:
Mac: macOS 10.13 or higher, Intel Core i5 or similar, Apple M1 chipsets supported, at least 8 GB RAM (16 GB+ recommended)
Windows: Windows 10 64 bit, Intel Core i5 or similar, at least 8 GB RAM (16 GB+ recommended)
Formats supported:
Standalone, VST, VST3, AU, AAX
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Runs in SINE
Mic merging
Preserve your system resources: Fine-tune your mix using multiple mic positions, then merge into a single channel within the player.
Greater usability
SINE is designed to complement the compositional workflow. Create on the fly with auto keyswitch options, and easy remapping tools.
Download single instruments
Choose only the instruments and mic positions that you currently need—no need to download the entire collection at once.