i’m playing with my new commodore 64 and trying out some demos that come with the machine. i don’t have a monitor yet so i just plug the audio channel into the speaker and leave the composite signal unplugged. i’m able to run a demo, beautiful generative SID music plays. all 3 channels must be set to triangle waves with long envelopes. i’m able to change the filter type with the function keys on the right of the c64. i switch to band pass. the music sounds resonant, clicky, and warm. the SIDs filter is slightly driven, i can tell this is the original chip. i’m in love with the machine. legendary demoscener lft is there. he tells me calmly that the graphics timing of this demo isn’t perfect, but it sounds quite nice with the monitor unplugged.