I finally got my PSS-30 working again. This thing is hilarious. Tiny keys, four volume levels, two voice polyphony, mysterious âPOPSâ rhythm. The âBANJOâ setting is a constantly repeating, octave lower version of HARPSI-CHORD. âELECTRIC GUITARâ has infinite sustain and vibrato for some reason. The temperament is wild, something like 12-TET of course, but with really horrible 3rds and nice 5ths, and not consistent everywhere. When no notes are playing, the speaker plays very quiet digital noise, which changes when you change instruments or hold down the âvolume upâ button. The PCB has a single DIP Yamaha IC and like five other components. I love it.