via this auction
Some pics of the plugs pulled below.
"Up for sale is a Vintage 1978 Muson Synthesizer by Mego Corp. in the Original Box. This is such a fun vintage electronic synthesizer that is still used in studios today that allows you to create endless sounds & rhythms or play simple tunes on the piano type keyboard. This is in great working condition and has been well tested. The unit itself is very clean and shows minimal to no signs of use. The decals are intact & vibrant in color on the battery compartment and along the top of the keys. There is some discoloration from the vintage adhesive (see pictures). All 10 colorful plugs are present including the 'black C plug' which is necessary to have to be sure the synthesizer generates the proper sounds before each use. There is a manual that was found in the box, it looks to me like a photo copy from years ago as this unit is colorful and I would think the manual would reflect the same. It explains your steps in using this synthesizer and the different functions it is capable of doing. This can make some really neat old school sounds from arcades, robots and space sounds. I understand why there are so few that come up for sale as this piece is a timeless treasure and is still used in studios today and it makes a nice curiosity display piece! This comes in the original box with one Styrofoam insert to hold it in place. The box shows some storage wear and some taping on the bottom and is missing some of the side art from possible tape removal. This requires 4 C batteries not included."
