The optional EXB-RADIAS is a 24-voice, 4-part multi-timbral (1 timbre per Program, up to 4 Programs can be used in Combi and Sequencer modes) RADIAS Synthesizer Board for the Korg M3 Music/Workstation. This powerful MMT-based (Multiple Modeling Technology) synth engine features dual oscillators which combine to offer analog-modeled waves, PCM waves, noise, ring mod and more. Waveform modulation, Variable Phase Modulation (VPM), Unison voice thickening, PWM and cross-mod expand the sonic palette. The EXB-RADIAS offers the same vocoder as the RADIAS, offering 16 bands with individual control over level and panning. Internal or external audio can be run through the EXB-RADIAS to be gated and filtered using the internal synthesis and effects.