I find this topic interesting and if I ever get an iPhone I might just try these out this sort of thing could save a beginner some serious cash. Instead of spending a wad on effects pedals to get started you can experiment and use things like this for practice until you’re ready to commit to laying out the money for the real deal.
https://gizmodo.com/this-iphone-powered-stompbox-will-add-up-to-five-effect-1845564154
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