I was shopping for a synth and I realized that I could buy a USD to 1/4 cable and plug a controller into an amp instead. I have no idea what a controller is exactly. Could some one explain? Do they have different voice on them or do I have to use a laptop? And can I do what I was planning on?

wrong forum? try GG&A
Gibson SG Faded
Epi VJ Stack

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Whenever I clean my guitars, my family wonders why it smells so good; I say that I exude a fresh citrus scent from hidden orifices.
They stopped asking