>> Davephillips, gratitude for comment!
The VCV Rack project is gaining momentum, but gradually, Linux users flow into its funnel. Yes, strangely, I only recently learned about VCV Rack. Everything has its time. Need qualifications. Presets exist, the whole mountain
For example, here
https://patchstorage.com/platform/vcv-rack/ But there are two obstacles. A downloadable preset requires all modules to be installed, which are very, very much for VCV Rack, so 99% of presets do not start immediately if you recently use it just because there are not "a million" different modules installed. Secondly, the presets for VCV Rack are very complicated, so it’s only the author himself or some fanatics who are ready to sit around for one preset for days to understand the circuitry and what is regulated. A good way is to understand the basic principles and design oneself, there is a base of video that helps to master various configurations.
>> GMaq, thank you for comment!
It's great that you are involved in the AV Linux multimedia distribution, a very necessary thing, bravo! Honestly, this distribution was out of my sight, I was interested in your project, I think over time to try to install it.
The modules for VCV Rack are organized according to the repository principle; basic modules are installed on the computer with synth base. Other modules keeping in the immense repository, from which you can install the right one as needed. There is even a Piano Roll music sequencer. So you can design a synthesizer with DAW elements.
>> Magicalex, Thank you comment and positive perception, good luck for you!
>> Folderol. Thank you for your comment! These are just the first steps, the beginners constructions, of course they are not perfected. Or maybe because it is winter, there is still snow and cool in Petersburg
For warmith twist the cutoff, put EQ on the output... and tube amplifier
Cheers!
). This config for VCV Rack on pic below. 
Devices GmbH