The most popular guitar rack software for Linux has to be Guitarix, and it is indeed free. Source: over 1 year ago

It has a range of its own plugins, but also works with LV2 plugins and, if things a correctly set up, also VST. Regarding guitar processing, you might want to look into Guitarix: https://guitarix.org/. Source: over 1 year ago

I know nothing about music, but I found this, maybe you can use it https://guitarix.org/. Source: over 1 year ago

Try Guitarix - free & open source, has Lv2 versions of it's effects for import into a DAW environment. Source: over 1 year ago

After that, you can navigate to the folder with the code (the folder containing the waf script), and run the commands as described on the Guitarix home page. It should go without saying perhaps, but you will want to uninstall any existing installation of Guitarix first, before you execute the sudo ./waf install command. Source: over 1 year ago

I've also used ZynAddSubFX, which is also a very powerful synth, though its interface (at least to me) is a bit of a clusterfuck. You could also try browsing this index of microtonally capable synths on the xenharmonic wiki. Source: about 1 year ago

The code for this can be found here on shadertoy! The audio was made with an Ibanez bass, Guitarix, Hydrogen Drums, ZynaddSubFX and Ardour! Source: over 2 years ago

Here is an additive synth - https://zynaddsubfx.sourceforge.io/. Source: over 2 years ago

There are VSTs for Linux. Surge, Vital, and ZynAddSubFx are three prominent examples, as well as OxeFM, Dexed, and plenty I'm forgetting. Surge and Zyn also come LV2 and DSSI, which are native Linux formats. For those who don't know, the VST3 SDK supports Linux, and is released under GPLv3 by Steinberg. Source: almost 3 years ago