Jeri Ellsworth showed a new project at the "Bay Area Maker Fair". This time she developed an Commodore 64 bass guitar. She combined an bass guitar with a C64 and a FPGA system. The FPGA system reads the signals from the guitar strings and the C64 keyboard. The input is processed by the FPGA and send to a real SID chip to produce the sound.

The C64 Bass keytar on YouTube