Yeah it would've been very hard to get a big sound on the old 4-track cassette machines. I started that way - the cassette machine, a basic drum machine with presets only, a home keyboard from Argos, and a CD player with an A-B repeat function, which is how I did looped samples. It was a headache. A lot of trial and error whilst wearing the tape down with every pass. Thems were the daze! I can't imagine trying to do industrial stuff back then. It was only the brilliant Akai sampler that eventually opened things out for me in terms of beats. And what a godsend those things were!
I'm not sure how I managed to get a clean ambient sound with the kit that I managed to get hold of - it wasn't much (but a huge leap forward from the 4-track stuff). I think I must've been a bit flukey or maybe it was because it was all new...the DAT machine with clean heads, new cables, new Mackie mixer. It has to be said that Portrait Of An Invisible Garden was mastered beautifully by one of the most experienced mastering engineers around and it was pressed on high quality vinyl which helped a lot. But still, the clarity in the original recording was somewhat anomalous.
These days I'm on a mission to avoid that level of clarity. Everything sounds so perfect now. It's not good for my head. I love imperfection in music, especially ambient music. Having said that there's no accounting for a 'perfect' production if you're making something for a 50K sound system. You wouldn't want to burn people's ears, I suppose.