> ermmm, I thought the Xpander used SSM2040 as the filter chip? It was a 3372. Only the early Pro V used the SSM stuff in the audio pathways. Regards, Tony Allgood Penrith, Cumbria, England Oakley Sound Systems www.oakleysound.co.uk Modular Synthesisers www.oakleysound.co.uk/projects.htm