Voice cards expand the functionality of the Bullfrog and make it even more versatile. Some voice cards replace patch cables - they connect the "modules* of the Bullfrog internally, while others have built-in mixers, signal generators, and advanced electrical circuits to control the synthesizer, for example, the Sequencer sends CV to control pitch and gate to start events on the synthesizer and the Sampler/Looper emulates reel to reel tape recorder functionality

DIY Voicecard Bundle is a set of three custom expansion cards for the Bullfrog synthesizer. Each voicecard mimics the connection points of the Bullforg. In order to make connections, you need a wire and a soldering iron (and bit of soldering skills). Use pieces of wire to connect the points on the voicecard and solder the wire.