The sixteen filters of FUMANA are well laid out on the front panel. What may not be obvious at first glance, however, is that sixteen more filters are laying under the hood, right at the heart of the module.

These other filters do not output any sound. Instead, their job is to process another signal (which we’ll call ‘modulator’) than the one which is filtered by the main array (which is our ‘carrier’).

They allow sixteen envelope followers to generate control voltages that follow the amplitude of the modulator. Such envelopes are internally routed to the corresponding filter on the carrier sound. The result is that the modulator “molds” the carrier’s spectral content, without altering its pitch information.

The most famous application of this circuit is vocoding, where the carrier signal is an overtone-rich sound and the carrier is a vocal part.


  • 1 FUMANA
  • 1 BRENSO
  • 1 333
  • 1 321
  • 1 SAPÈL
  • Speech source
  • CGM (Optional)


  1. Patch BRENSO’s Final output to FUMANA’s Main input.
  2. Set FUMANA’s sliders to the lowest position.
  3. Patch an external speech to the 333 module.
  4. Patch the speech to FUMANA’s Mod input.
  5. Adjust the Main and Mod signal level.
  6. Adjust the Envelope Follower controls.
  7. Patch FUMANA’s All output to CGM channel 1.
  8. Patch a copy of the speech to FUMANA’s Unvoiced Input.
    (This will emphasize the sibilant and fricative sounds and make the speech more clear. You can also patch any other signal to this input.)
  9. Patch FUMANA’s All EF out to the input of a 321 section.
  10. Invert it and apply a positive offset.
  11. Patch the inverted EF to the CGM effect send to duck the reverb.
  12. Patch another copy of the speech to FALISTRI’s Slew Limiter input.
  13. Patch the Slew Limiter output to the yellow generator’s Trig/Gate input
  14. Patch the yellow EOF output to SAPÈL’s clock output.
  15. Patch SAPÈL’s 2ⁿ out to BRENSO’s V/Oct input.
  16. Patch the output of a given band’s envelope follower to Brenso’s Timbre Modulation CV input.
    (Now the selected band’s intensity will modulate the timbral section.)
  17. Cross-patch some bands’ envelope followers to some other band’s CV input to achieve more experimental results.