Can an old Commodore 64 Synth actually make music? J. Fredrik Andersson proves it can. In his latest video, he transforms the 1982 home computer into a working synthesizer. Using the legendary SID chip, a MIDI interface, and a few clever modifications, Andersson shows how the Commodore 64 Synth creates rich, expressive tones that rival modern instruments.
The SID chip was groundbreaking when it launched. Designed by Bob Yannes, who later co-founded Ensoniq, it features three voices, multiple waveforms, and a 12dB analog filter. Andersson explains that these capabilities give the Commodore 64 Synth a genuine analog character. It’s not just retro charm—it’s a surprisingly capable sound machine.
To begin, Andersson connects the computer’s mono audio output to a mixer using a handmade cable. He mentions that builders can create their own or buy adapters online. For visuals, he uses an S-Video to HDMI converter. However, he notes that a CRT monitor adds the perfect retro feel. Next, he installs a MIDI interface from Tim Harris, which allows him to control the SID chip with an external keyboard.
Andersson then loads Synthcart 64 onto a cartridge. This step eliminates the need for slow cassette or disk loading. Using a Mini XPander cartridge splitter, he connects both the software and the MIDI interface simultaneously. Once running, he demonstrates waveform selection, portamento, and chord modes. The sound quality impresses right away.
Later, he adds reverb and delay effects to enhance the SID’s raw tone. The result is a warm, textured sound that feels alive. He also teases a “boss-level upgrade” that adds a second SID chip. This modification doubles the available voices, transforming the Commodore 64 Synth into a serious studio tool.
Before wrapping up, Andersson discusses the aging filters in original SID chips. To address distortion, he plans to install an ARMSID replacement for cleaner output. He ends by saying the Commodore 64 Synth is far more capable than most expect. It’s a blend of vintage computing and music-making that still feels fresh today.
