Another idea is a DIY kit for a pedal.
Of course this only works if your buddy is patient enough, and you might have to offer a few tools as well.
For someone speaking French, I would strongly advise Techniguitare’s kits, they are extremely good quality and easy to build.
But you should find other kits elsewhere, even synth kits.

Another thing that might be good is a second hand Model:Samples or Model:Cycles.
After years of playing guitar and bass, having a decent groovebox opened a new world, to me.

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