Any Quad titles that were released as a Q4 Discrete Quad Open Reel tape in one area and as a Matrix Quad Encoded Stereo Open Reel tape in other area(s)?
I don't know of any, I thought that somewhere in the World, a record company division might want to use the Quad mix done by their parent company, but Q4 duplicating and/or playback machines weren't available in that area, so a Matrix Encoded Stereo Open Reel prerecorded tape was released.
I thought Radio Shack might have released a Matrix Encoded Open Reel tape (and probably using the EV Stereo-4 system - I bought their Stereo-4 encoded demo cassette [the Open Reel tape appears to contain the same content]).