AeronometronResonant/Formant Filter With Multiple Control Modes

From the vendor

Aeronometron is a modulated filter pedal that is really just my take on the excellent Sentient Machine from Parasit Studios. In fact, the audio path is the same as the Sentient Machine because why mess with something that sounds so good? Additionally, the filter topology itself is fairly standard. The real genius of the Sentient Machine is in the use of CMOS switches as variable resistors.

So what makes Aeronometron different? Well, there are a couple of things. First, the Sentient Machine utilizes a rather expensive (~$8 USD) opamp for the LFO generation. This LFO is a modulated high-speed PWM signal and there aren't really any other opamps that have been found to do the same job. When I hear “PWM” and instantly think of a microcontroller (MCU). Microcontrollers are built for providing PWM signals, and creating one at the ~50 kHz used in the Sentient Machine is really quite simple. Als