Waldorf Microwave XT XTK II 30 Voice Expansion Card

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via this auction

Announced back in February, these are no longer available from Encore.

Update via kurvenschreiber in the comments: "just asked Tony, and that is not true, next batch is baking now"

Auction description:

"This is the hard to find XT voice expansion Card. Out of stock at Encore and they don't plan on making any more. Waldorf stopped making these 10 years ago, only other way to get these is in the off chance you will find an expanded XT. This board has been tested working and parts are all new stock. Do not buy if your XT, MWII or XTK has Board #1 or Board #2 - It will not work!!! Check your XT by going to utility menu and clicking in 6 times, this will tell you your board revision. Only Board#3 is compatible and you need to remove the stock jumper and install the included hardware. Best advice is to have your synth shop install it. Final requirement is your OS must be 2.33 for best compatibility and your XT/XTK/MWII must be in good working order!!!

BIN is higher than Encore price due to the fact that it is out of production by Waldorf and Encore. By purchasing this item you agree your hardware meets the minimum requirements..."