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So my amp has a bass compressor built in but...

It really just depends on if you like it or not.

My amp (Mesa Bass 400+) has natural tube OD. People will show up in here all day long and talk about how "natral toobs OD is better than enythin' a pedle can play" (I always picture these old guys as hicks for some reason). To me, pedals are just better. The Elements is amazing. B3K. Swell pedals. The Grombass is on it's way too many. So many different flavors...different sounds....different uses.....

Compressors are the same way. It would be a miracle if the compressor built into your amp is the one you like the best.
 
There isn’t much information on the TNT compressor other than it is an optical design that I read somewhere. It may be a decent one knob compressor, but the way the circuit block diagram is drawn you can not use the compressor with the crunch circuit. It shows that only one of those two functions can be used a time.

-Frank
 
try a couple of compressors in store through a tnt if you can. If they do something you can understand better than the amp and you'd use it then I say go for it.

My amp has a great compressor built into it but I prefer the sound I get from my external compressors. When I don't use my pedalboard I can get a fatter punchier tone than dry withmy onboard comp but it's all pretty subjective to taste. Glad I have options. You'll never know what ou want till you try to understand what it it that you like