ROE EKm audio capacitors. german made? any good?

after testing these capacitors with a capacitor tester DE-5000, i see that 95% are around 600uf instead of 1000... german or not i say ist Kaputt.
electrolytic capacitors change value and esr in frequency, and basically act like a filter. who would want that in the signal path? (not in a filtering circuit)
i think i will buy foil capacitors and would fit them somehow (they are x10 bigger)
any thoughts?