Buchla model 291e Triple Morphing Filter


Buchla & Associates

The 291e Triple Morphing Filter consists of three voltage controlled filters operating independently or in parallel.

The amplitude, center frequency, and bandwidth of each filter may be independently voltage controlled. Each may be modulated with externally applied signals.

The morphing capability might be described as moving through a series of snapshots of the filter, with each snapshot consisting of a complete description of the filter parameters, and with each parameter continuously varying between snapshots. Morphing is accomplished with an applied voltage, or alternatively can be initiated with a pulse, with each stage time independently set. Up to eight stages may be employed.

A solo switch provides editing convenience, and an expand input allows ready expansion of the site.

All of the 291e's settings may be stored and retrieved with the model 225e preset manager.

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