Rakarrack has a GUI written in FLTK. It was my earliest adventure with guitar effects and DSP (ca 2008); it ran on a potato laptop and still kept up, which made the whole setup actually viable for spontaneous jam sessions at other people’s places. Good times.

– Source: Hacker News
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8 months ago

I was messing around with a guitar, a USB interface, and a software called https://rakarrack.sourceforge.net/ (I don’t know if it is available on windows) and it was a lot of fun! You could scroll through the presets and make the guitar sound like all kinds of things! Definitely worth tinkering with.

Source:
over 1 year ago