What looks like a MIDI connector to you is a so called DIN connector that was originally used mostly for home electronics and HiFi equipment before it was used as MIDI connector. It still can be found on old turntables, hifi amplifiers and alike.
pin 1: record left
pin 2: ground
pin 3: playback left
pin 4: record right
pin 5: Playback right
just be careful, as the numbering is not subsequent!
What you would need is a adapter from 5 pole to RCA + RCA-Jack adapters + 2x DI Box to connect it to your SQ