The Gameboy has LSDJ, the Atari 2600 has SynthCart, the Commodore 64 has MSSIAH. the does the NES or SNES have a sequencer cartridge like these? I know of Chip Maestro, but I'm not really looking for something that is solely MIDI controlled or controlled by an external sequencer, I want a built in sequencer. Do cartridges like these exist for the NES or SNES?
(Apologies if this is the stupidest question ever, but I'm new to chip music and suck at Google.)