Yamaha PS-20 Automatic Bass Chord Keyboard System READ DESCRIPTION Keyboard turns on, and makes sound. That is the only functionality that I guarantee. I have found the following flaws, but there may be more. 1. General cosmetic issues, see pics 2. Missing the switch to change the master volume 3. The key all the way to the left, does not make any sound 4. The speaker makes a humming noise.
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