Thanks for the comments.
I write all the tracks using beepola, 1tracker and Bintracker plus an .XM convertor for radio in the rain.
Then I load all the .tap files into a real spectrum 48K or 128K +2 using an SD card reader. The tracks are then played back on real hardware and recorded from the mic socket output into audacity on my laptop.
I then EQ the recordings but no filters are applied to remove any crackles to try and preserve the authenticity.
Album download is free on bandcamp, just put zero in the amount. The liner notes and the .tap file to play on real hardware or emulator are also included.