This is the official Arduino library for the Ultimate Voice Changer Arduino Shield, which is an open source hardware project that uses an MCP3208 ADC and an MCP4921 DAC with SPI communications to provide high quality voice sampling and real-time audio manipulation.
Eagle schematics and board layout for an Arduino Uno shield are included in this repository.
You can also purchase easy-to-assemble kits online from http://ultimatevoicechanger.com
Currently, there is a single sketch available for a ring modulator effect.