Yamaha RX21 Drum Machine
This machine has nine different voices, and 40 different pre-set patterns which are held in ROM. These can form the basis of your songs as they are, or you can alter them as much as you like and enter them into RAM (without destroying them). They'll now play in the normal way. Yamaha also thoughtfully provide several 'tacets' to spice up your patterns as well as 56 user programmable memories. RX-21 has a capacity for 100 patterns and, as with most state of the art drum machines, to avoid running short of memory you may always dump to cassette and load the digital info back in again when you need to. As you are no doubt aware, you need to join several patterns together to construct a whole song. RX-21 has this facility, of course, and will hold up to four songs with a maximum of 512 parts each.
All tested and working. Comes with non original 9v PSU
I have an electronic copy of the manual which I am quite happy to email to the buyer upon request.