Single finger chord with fixed timbre (rough squarewave organ). 8 preset rhythms {rock, disco, swing, samba, bossa nova, tango, slow rock, waltz}. 32 midsize keys (15 of them used for chord section). CPU "HD61702A02, 8D 43" (100 pin SMD) with timbres based on 2 layered multi-pulse squarewave waveforms with different digital envelopes, those are differently low pass filtered through capacitors.