Hohner Bass 2 Keyboard For Sale. This funky little vintage guy will delivery a cool bass tone to your music. There are 3 sounds - bass, guitar and, yes, tuba. Theyre all variations of the same sound. There's also adjustable decay. This is a very simple device. We heard Stevie Wonder used one back in the day and maybe even appeared in the original ad, but havent verified this. Though let's get real now - what keyboard instrument has Stevie NOT used?