I have found some articles from 1982-1985 about Spectrum musical hardware and software. I am not sure if all this is in the database, probably only XRI Micon and its Step Time Sequencer.
http://www.muzines.co.uk/articles/micromidi/6021
http://www.muzines.co.uk/articles/micro-music/4409
http://www.muzines.co.uk/articles/spectrum-midi/7920
http://www.muzines.co.uk/articles/micromusic/5848
http://www.muzines.co.uk/articles/softw ... rator/1766
http://www.muzines.co.uk/articles/xri-m ... oller/9069
http://www.muzines.co.uk/articles/micons-no-con/3817
The latest ZXDB update will be applied this evening at 1800 BST. The update takes around 30 minutes, and the site goes down whilst this happens.