YAMAHA CS-50

via this auction

Note the CS50 does not have the ribbon controller or preset patch panel of the CS60. The synth engine of the CS50 and CS60 is half a CS80. A CS80 allows you to layer the two engines or rather two patches. Here's a funny analogy that may be blasphemy to some. It's similar to the Roland GAiA. :) With the GAiA you layer four synth engines, with the CS80 you layer two. See this post for some pics for the following: If you look at the patch selections there are two rows. You select one patch from each. If you look at the panel there are two rows, you edit the upper patch selected with the top row and the bottom with the bottom. If you look at the user patch panel you will see four rows equating four user presets that can be saved, the first two can be selected in the top row of patch buttons, and the bottom two on the bottom (see this pic). Note you aren't saving presets to any memory, you literally set each slider and leave it where you want. If you look at the CS50 and a CS60 you will see they consist of one row or engine of the CS80s two. The CS60 adds mono aftertouch, the preset patch panel, and the ribbon controller. The CS80 adds the second synth engine and poly aftertouch. Note there is a mod that allows you to layer a single patch on the CS60 and I'm assuming CS50 to go from an 8 voice single patch to a 4 voice layered patch. If anyone has more info on this mod, let me know. [Difference between the CS50, CS60 and CS80]