The 257e slew rate processor shapes CV transitions by independently controlling positive and negative slew, enabling portamento and waveshaping via slew

Sections C-H of the 257e independently set positive (rising) and negative (falling) slew rates for CV inputs, with a range of 0.01 to 10 seconds. Applying a square wave and matching both slew rates converts it to a sine-like shape; mismatching produces asymmetric sawtooth-like waveforms. The module notes that true square or sawtooth outputs are impossible because slew never reaches zero. An auto-pulse mode sends a pulse every time the output CV reverses direction, enabling rhythmic triggers from any continuously varying CV source. CV inputs can modulate slew rates.

Examples

Patch a step CV (from 251e sequencer) into the 257e with slow positive slew and fast negative slew — notes glide up slowly but jump down instantly, like a Hawaiian steel guitar bend.

Assessment

A square wave is patched into the 257e with positive slew at 0.5s and negative slew at 0.5s. Describe the output waveform shape and explain why it cannot be a true sine wave. When would auto-pulse mode be useful?