Envelope Follower
What is it?
This took me a while to figure out honestly so I thought I would try to explain it. The idea is to take an audio source and make an envelope that follows the amplitude. This can be useful for making an auto-filter on a guitar, making a sort of side-chained sound from a kick-drum, and a myriad of other uses.
Another way to think of it is a slew or portamento but for audio. It smooths out the transients giving you an averaged waveform that can be used for CV control (such as to control the cutoff of a filter).
Usage
The envelope follower is a semi-dedicated mode. At present it samples audio from the CV input and outputs the resulting envelope over the main Audio output. Future versions will make this configurable, which will include using the "internal" audio as a reference.
Currently the follower has 3 configuration options:
- Up Rate: The response rate of the envelope when the signal is increasing
- Down Rate: The response rate of the envelope when the signal is decreasing
- Attenuation: The amount to attenuate the amplitude of the envelope.
00 means no attenuation, meaning the full signal is outputted, and
FFis nearly zero. Note that this is digital attenuation such that at high attenuation, one should expect some loss of precision and the potential for artifacts. Consider using an external analog attenuator if those are undesired.
The settings are controlled by the left and right knobs. The left knob selects the item and the right adjusts the parameter. Parameter changes are automatically saved.