Hi Ronny, [E510] Did you try Doepfer in Germany? They sold E510 a couple of years ago, maybe they have still some. Fax: +89-89809511 http://www.doepfer.com >Perhaps I could program a 8031 to do the job Very interesting project. The E510 were quite expensive. They offered attack and release velocity, but IMHO the latter is not necessary. Regards, Ingo