Do you know it? I've never heard about this device, in few words we can say it's a portable Music Module. Take a look
this comment from here:
musicthing.blogspot.com/2005/06/ebay-of-day-philips-cassette.html
Hi! My name is Bill Hewlett. Interesting to see that people still find my product interesting! I worked for Philips in the Netherlands for may years and I was responsible for this product concept, developing the business and marketing plans and obtaining funding from Philips for this project. It was based on a music cartridge application for MSX home computers (remember them?!) - I was confident that for the same price (99 pound retail) I could develop a complete music composer that would incorporate a cassette recorder for recording data and musical compositions. It was designed by Philips Industrical Design (thanks Gavin!), engineered by Richard Watts Associates (Lindsay was lead engineer) based on a Yamaha FM sound chip, and I had the unit manufactured independently in China. We sold around 50 thousand products worldwide (Spain was a big market) before Philips pulled the plug. Yamaha liked the idea so much they went on to produce a similar (cut-down) product.
If anyone is interested in getting more background on this product then get in touch with me at hewlett@planet.nl (I still have a few units here, plus collateral, manuals, accompaniment tapes, music books, etc.). p.s. Midi was not included on this unit.
Here a video:
www.youtube.com/watch?v=ZnhgRQvaQ3w&feature=player_embedded#