I'm trying to find the discontinued Groove Tubes mics' frequency response curves. It appears Groove Tubes was taken over by Fender, and the microphones stopped production.

I'd like to have the frequency response of GT Velo-8 and GT MD1b-FET (these are modelled on Amplitube Fender; I've found the frequency responses of all other modelled mics on Amplitube Fender except these two).

Does anybody know where to find them?