Hey thanks @dsiah
I just transferred the side a and side b stereo .aiffs into my mac via USB.
I added some compression and eq (also some Valhalla reverb) in ableton to the stereo tracks (my attempt at mastering) but no saturation.
Any buzz etc is probably from me sampling the radio etc.
The sound of the Op1 synths on their own is ok, but for me the magic is the ease of integrating samples and recordings into the op1 workflow (something as simple as a built in mic has a big effect on usability imo).
Slowing the tape down also definitely has an effect on the tone; I like it 