About
Four cascaded JFET-based all-pass filter stages whose cutoff frequencies are swept by a low-frequency triangle oscillator. The dry signal is summed with the all-pass output to create notches that sweep across the spectrum.
Signal chain preview
5 stagesInput
Input buffer
4× JFET-based all-pass stages (matched 2N5952 as VCRs)
Output
Quick facts
- "Brown sound" album-Eddie tone leans on a script-logo Phase 90 set medium-slow.
- Script-logo (no feedback path) is more subtle; block-logo adds feedback for a more intense, vocal swirl.
- Uses matched 2N5952 JFETs as voltage-controlled resistors — matching is critical.
Controls
- Speed (500k reverse log)