EQ (EQUALISATION) The process of altering the levels of FREQUENCIES that comprise a signal. Envelopes require a TRIGGER or GATE (typically from pressing a key on the keyboard) which then controls the volume of an AMPLIFIER and/or the tone of an OSCILLATOR (via filter CUTOFF).

Most of the classic wah pedals are bandpass filters wherein the pedal sweeps the center frequency. ENVELOPE A WAVEFORM that changes over time. A bandpass filter can be thought of as a low-high pass sandwich as it reduces or cuts spectral content on both sides of a specific center frequency. You’ve just made and modulated a simple filter and possibly weirded out your coworkers.Ī low pass filter removes or attenuates frequencies above a specific cutoff point, allowing the content below that point to pass a high pass filter removes or attenuates frequencies below a specific cutoff point. Notice how the airy high frequencies go away, but the lower frequencies remain? The note doesn’t change, but its sonic character does. I thought this pedal would let me save various configurations (it has 6 banks for saving stuff like EQ settings and effects), but the sad reality is that each knob (primarily sweep range and frequency) is very touchy. Make the “eee” sound with your mouth, hum a note of your choosing, and then slowly shift your mouth and tongue into the “ooo” sound while continuing to hum. I CAN advise that a pedal like the Source Audio Bass Envelope Filter Pro might have TOO MANY controls. If you are asking what is actually does, here is a pretty good explanation from :Īn audio filter is a device that removes or reduces the volume of a certain frequency or set of frequencies from the signal going through it.

What is an envelope filter