Hello,
mentioned pedal is DSP based Boss EQ-20. It is discontinued now, but available used.. It is only programmable EQ in pedal format, which i'm aware of.. (i haven't use it personally, so can't comment quality.)
Boss EQ 20 | eBay
There are another options which i would try,
- VT Bass Deluxe (programmable, SVTish tone stack)
- EBS Micro Bass II (two independent channels)
not dedicated programmable EQ, but both can be nicely used to expand tonal palette of your amp and serve as good DI for backup.
Michal