Expand the functionality of your synth with the Erica Synths Electric Organ Voicecard, an expansion card for the Bullfrog synthesizer that makes the internal connections emulate a pipe organ. It illustrates the principles of additive synthesis, where several waveforms are mixed together to generate more complex sounds.
The voicecard's pulse wave is sent though a divider, and all outputs of the divider are mixed together with the original signal and sent to the VCF and then to the VCA. The divider splits the original frequency by even numbers, resulting in a pitch with even octaves down from the original pitch. Each fader on the voicecard determine the amplitude of each suboctave.