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"Buchla USA era Easel Aux Expander card. Original packaging. Works perfect. Noise, filter, extra oscillator all sound fantastic through Aux In. By using internal midi buss the oscillator will track pitch perfect.
The Aux Card offers an auxiliary modulation CV source and noise source in low range and a CV/audio oscillator source in high range that can be mixed with the noise source. The noise source also can be filtered. All these parameters are CV controllable. In low range this auxiliary modulation oscillator allows the 208’s Modulation Oscillator to assume audio duties and can be used as the modulation source for a variety of uses. In the keyboard bus setting, it provides a tuning reference for your 208 or can be controlled with internal bus capable 218e keyboards.
They’ve also given you more control with more inputs. They’ve added one more pulse input and give you a choice of switchable destinations. We also added switchable control of timbre pot and switches via the “to card” inputs already on your 208. Did you know you could CV control switch settings? Destinations include the timbre wave shape, the Modulation range, gate source, the VCA LPF mode, the Modulation wave shape and Modulation Variation."
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