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Compressor.
Maybe. A compressor can make a player sound fairly good and professional pretty fast. However, it can really be a crutch for slapping, as well as many other techniques. It'll reign things in, especially if you toss a fast attack and release on the compressor, but it really can hinder good technique in the long run. As such, the player can sound that much worse in a back-lined situation, a jam or when the compressor breaks. If you get one, I suggest almost never practicing with it, and mostly using it just at gigs and such.
An Autowah/envelope filter is the next obvious thought. The EXH Bass Balls is a good one, but has a distinctive twin filter sound that may or may not work for the the player. I'm more familiar with some of the more higher end autowahs then stuff under $150 or so, so I'm probably not the best to ask advice. If you want to go boutique or higher end, then I suggest the Source Audio BEF.
You could always try a manual wah pedal.