Thanks MikeyG.
Glad you like your BenQ too. Out of interest I did find that a magazine cover demo of Dyna Blaster (which is obviously in a weird screen mode, as it plays with a wonky border and flickers on a TV) didn't display at all on the monitor (black screen only), but Workbench stuff seems super cool. I haven't tried any other games.
Re getting it working, basically it was a case of going to the command line in Workbench and running SELECTOR.ADF from the command prompt to set things up. Touch wood it seems to be working fine now although I haven't tested it extensively. I did mess it up once by not including SELECTOR.ADF in the cortex boot list but hopefully I'm back on track now.
Looking forward to having a good play with it. I'd like the Amiga to replace the PC in the studio but I need to get to grips with it first. On the wish list is a copy of MasterSound to accompany the sampler. I managed to download a DMS file but didn't manage to convert it to an ADF successfully. I'm going to go have a play with it now and see if Octamed recognises the sampler. Might plug in my MIDI interface and see if anything happens, too.