There was a computer shop on Deansgate, Manchester in the 80's which I can't remember the name of (Mamelok I know was a music shop but it was similar sounding and nearby).
Anyway, every time I went in there was an Atari computer running a continuous music loop with a synthesised voice saying 'Pro Sound Designer' every time it looped. That voice has been stuck in my head ever since.
The only reference I can find was for an Atari ST version, which it could have been, the ST came out in '85 and I left Manchester summer '86, but I'm sure it was an earlier Atari running it, I stand to be corrected.
Edit* I got my memories mixed up, after a bit of research (looking on YouTube) I worked out the music loop was the Atari 800 storefront demo. The Pro Sound Designer loop must have come later (I spent 95% of my life in computer shops in my 20's) there's a YouTube video of that and it's exactly how I remember it.