A side is Freak Out, B side is Dr. Hoo Hoo, Mr. Tomomatsu were recording and mixing the same as the previous two 7", and legendary L.A Punk's engineer/producer GEZA X were mastering these songs.
why past continous? Is it to emphasize the lenghts of the recording and the mixing? .
I think past simple could do it as both mixing and recording are over and completed at the time of writing .