The 291e Triple Morphing Filter interpolates between stored filter snapshots over time, with per-stage timing control

The 291e stores up to eight snapshots of its three filters’ amplitude, center frequency, and bandwidth. The morph voltage or a clock pulse steps or smoothly sweeps between these snapshots. Individual parameters can be set to jump or morph independently: a filter can jump in frequency while slowly morphing in amplitude. Stage times are independently set (0.01-10 seconds). The module has four modes for stage advancement: free (time-based), cyclic (loop), enable (advance only while gate is high), and sustain (pause while gate is high). A solo switch on each of the three filter nodes aids programming.

Examples

Program 8 stages with slowly increasing center frequency and decreasing bandwidth to create a narrowing spectral sweep; set cycle mode to loop continuously; voltage-control the morph to scrub between stages live.

Assessment

Explain the difference between a capitalized and lowercase field identifier (e.g. F vs f) in the 291e’s stage display. Design a four-stage patch where frequency jumps but amplitude morphs smoothly.