Tetrad Quad-Harmonic Voice

Tenderfoot Electronics Tetrad

Tetrad is a expressive four-voice digital oscillator with Subharmonic, Harmonic, and Detuning modes, providing a wide spectrum of timbral possibilities. The four Oscillator Modifier knobs allow you to adjust the harmonic relationship of each individual oscillator to the fundamental. In the Subharmonic mode, turning a dial divides the fundamental frequency by one to 24, while the Harmonic mode multiples the fundamental frequency by one to 24. The Detune mode lets you adjust the pitch of each oscillator by a range of two octaves up or down, in either direction. This, in combination with the 1V/Oct input lets you create anything from morphing, evolving drones, to complex detuned timbres for rave-ready leads. Each Oscillator Modifier comes equipped with its own CV input, meaning each one can be controlled independently and integrated into larger patches for fluid, moving sounds.

The Tetrad is capable of four different waveshapes—Sine, Triangle, Saw, and Square—each of which can be morphed-between with the Shape CV input for scanning across the wavetable. The Trig button and CV input allows you to take advantage of Tetrad's onboard envelope generator, which is capable of producing AR or ASR envelopes, allowing for instant playability as a self-contained voice. Tetrad from Tenderfoot Electronics is a versatile module for anybody looking for an expressive oscillator with a ton of tools for shaping its timbre in real-time.

Tetrad Features

• Versatile four-voice digital oscillator
• Available waveforms: Sine, Triangle, Saw, and Square
• Shape CV input for morphing between waveforms
• FM CV input
• Onboard envelope generator with AR and ASR modes
• Oscillator Modifier knobs and CV inputs for changing the harmonic relationship to the fundamental