The 1583 can go in either way. Its symmetrical about its middle pin. But don't push it too far in other wise you may splay the legs (ouch!) and break the internal contacts. Regards, Tony Allgood Penrith, Cumbria, England Oakley Modular Synth and TB3030: www.techrepairs.freeserve.co.uk/projects.htm My music: www.mp3.com/taklamakan