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ISP Beta Bass rack vs pedal preamps

Dear Community,

I was browsing the Internet for some preamps and found that there exists two versions of the ISP Beta Bass preamp. The first (and older) version is a rack preamp and the second version is a pedal preamp. The pedal version seem to have more features than the rack version, and comes at a cheaper price (approx 200$ difference between the two).

What are the main differences between theses two units? What justifies the difference in terms of price ? Does anyone have any experience with these?

Thank you!