@[email protected] Melody boards can be emulated by Stella IIRC. So ROM download makes sense. A Harmony cartridge is a good idea anyway, in my opinion, if you have real hardware. But ymmv. Melody doesn’t add that much to the 2600 hardware. It can emulate Sara, DPC and DPC+ and also do all the bankswitching. But you are still massively limited by the TIA.
Also the Audacity Games do NOT use Melody boards.
@[email protected] but then I would suggest getting the full cartridge. And all Champ Games have demo ROMs to try out before you buy. Those you can play on the emulator if you don’t have a Harmony. If you like the demo, you can buy the cartridge.