I built up a 3-band preamp for the Sirena Modelo Uno bass. I voiced it to work specifically for the Funktronic Bass Sidewinder pickup placed in the bridge position. It bumps a little low end up around 35Hz. A friend recommended swapping the TL072 out with an LT1352 and it sounds great. I’ve been gigging with this rig for a while now and it definitely does the job.