The Pentodian Resonator Choir: Kontakt Choir Instrument by Loot Audio

Loot Audio says the choirs began as short pulses from a hand-configured analog signal generator, with pitch vibrato applied through its swept oscillator. The pulses were shaped into exponential ramps and passed through a passive triple L/C resonator to create the vocal formants.

From there the signal was buffered through vintage tube gear, then overdriven and equalized. Some multi-samples were further processed with an analog chorus. The developer notes that over 100 samples were captured note by note from this hand-built setup.

Some choirs were made by routing other sources through a rehoused Polymoog formant resonator section, and one was recorded to tape and resampled, adding further variety to the character of the set.

The instrument uses a 4-voice layering engine that lets you combine sounds and save the result. The library includes 12 editable example instrument patches to show how the choirs can be shaped, and 8 example layered multi patches that combine them.

The 215 samples are 24-bit, and the choirs are multi-sampled across the keyboard so that pitch and expression stay consistent when played.