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via
this auction
"This is a very cool and rare vintage early 80's Korg PK-13 analog bass pedals and Korg BPX-3 bass sound unit. Everything works as it should. The sounds produced from this are smooth, sub-bassy, deep, full and fat as you would expect from a pure analog bass. You can control the tone with the bass and treble eq, as well as attack, sustain, and 'click' (kind of like a decay setting). The controls provide basic shaping to fit your bass sound in a mix, but the sounds themselves are totally basic and can be used on anything."