Maybe ,but if I remember correctly it was difficult to try and get Q4 releases , and the selection was limited.By that time, it became known that the high sales of Q4 reel recorders was due to people building home studios instead of quadraphonic systems. Some company heads got so mad that the company threw out everything quadraphonic they had.
Every Q4 reel system I ever serviced (as a service technician) was in a home studio.
Too bad as I thought Q4 was the best quad system in which to playback and hear quad .
For me personally, I never saw any Q4 tapes for sale in any local shop.
Players or Q4 Decks were available here, but a bit costly.