Resonant Voltage-Controlled HP/LP Filter.
This module cuts off some frequencies, amplifies the resonant frequency, and changes the signal’s timbre. It is a key component of any subtractive synthesis chain.
There are two working modes: high-pass and low-pass. The modes are switched by a button.
When the resonance is increased, the output signal starts to overdrive, adding even more colors.
On maxiumum resonance filter starts to self-oscillate and can acts as oscillator. For example, it can be used for creating kick sound.
The resonance amount and cutoff frequency can be controlled directly by knobs, as well as by external CV.
There is an attenuverter on the cutoff CV to control the cutoff CV amount (Depth knob). For example, you can set the depth to the middle position, and CV will have no effect on the cutoff frequency.
In the maximum position (+100%), a 0–5V envelope will increase the cutoff amount.
In the minimum position (-100%), a 0–5V envelope will decrease the cutoff amount.
Image of the latest released version of the module. This is not the final product, development is in progress.
Known issues:
resonance CV is needed
depth knob is inverted
resonance is too loud and sensitive, and also depend on cutoff frequency
Wow! This concept has definitely caught my attention; especially with (I assume) use DSP creations?What filter architecture/toplogy are you using for this filter module? Also, I see you mentioned the modules are hackable; are you going to have a dev board module configured for implementing user created analog filters?
Looking forward to see more interesting implementations as well!
We had dev module, but after some experiments I understand it’s easier to mockup schematic directly on the breadboard between the modules. Maybe we add some helper modules as „just N potentiometers”, like in Bleep’s Rad-Fi concept
Mentioning the rad-fi system the rad-fi delay could be an amazing module to add to this system if you’re able to work with/get permission off of bleeplabs to produce one.
“Is it / why isn’t it an Arduino shield?
Both the Delay and Patchable Synth contain an ATMEGA328 running the Arduino bootloader. Instead of having a dedicated shield the devices are all on the breadboard so they can be infinitely modified and made into something completely new”
Had a look at their github and everything is still up and some stuff was updated as little as 10 months ago.
Slept on this kit many years ago as i was even more of a novice than i am today with diy kits haha
