On the microcube - the jc clean / black panel / r fier are amp models based on the jazz chorus, fender blackface and mesa boogie rectifier (not sure which one). You'll find they have different sounds, so just play with them all - different ones are good for different things. I like the rectifer one, but it is pretty full on!
The effects are hard to describe - again, playing with the settings is the best way to learn... each have their place
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