Multiplier is an embedded audio effect made with the Daisy Seed microcontroller. It re-pitches and harmonizes incoming audio signals into 3 different voices.
Multiplier has 4 knobs, 3 switches, and audio I/O. The 3 primary knobs control the real time pitch shift of the incoming audio signal. The switches turn on/off the corresponding pitched voice. The final knob controls the global mix of the effect.
The device is well suited as a live vocal/guitar pedal for realtime performance. It is situated in a convenient and small plastic box.
The video features an original song by jack kilgore. We wanted to focus on the humanised algorithm aspect of our project and show how our tool allows users to capture a unique vibe.
process & design
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the tech
How does it work?
Algorithm Description: The device splits the signal into 3 different real-time pitch shifted voices and mixes with the dry signal. The pitch shifting algorithm works by feeding audio into a delay line and replaying small grains of windowed audio at a faster or slower rate. Two grains play at a time, with a constant overlap add Hann window. The code is written in a convenient C++ that can be ported to other codebases.
Hardware Description: In order to control the instrument physically, four potentiometers and three switches are connected respectively to the Daisy Seed microcontroller. Users play with the instrument intuitively.
