Turns out I can get a bit of a growl going with this thing: Dr J Sparrow bass driver and DI
. I guess it's the Joyo version of the SansAmp.
I bought it for a project, delivery was delayed and I completed the project without using it. Your question made me wonder about it, so thanks!
Turn up the Low, Drive almost but not quite to max (most of the effect is in the last 1/4), dial in some harmonics, using the neck pickup on an old Yamaha RBX bass.
Mind you, one man's growl is another's fart (you can get that effect too without too much effort).