Erica Synths Bullfrog Electric Organ Voice Card creates internal connections in the Bullfrog synthesizer to emulate the sound of a pipe organ while playing notes with octave intervals simultaneously, and also illustrates the principles of additive synthesis, where simpler waveforms are mixed together to generate complex sounds. Internal connections simplify patching.
Voice cards extend the functionality of the Bullfrog synthesizer, making it even more versatile. Some replace patch cables by internally connecting Bullfrog "modules," while others include built-in mixers, signal generators, and advanced electronics to control the synthesizer. For example, the Sequencer sends CVs to adjust pitch and gates to trigger events, and the Sampler