I love the feel that MSX sounds have. I use to compose music on my Mac and I wonder If there's any app that can play sounds like an old computer. I'll apreciate your answers.
Best regards,
Miguel
App, as in application? A program would comply and an emulator has turned a retro computer into a program...
Ergo, go find blueMSX or openMSX... Go for the first one for an all in one package and for the second one if you don't
Other than using emulators + tracker/sequencer, if you wanted to use MSX's psg sound to compose music on Mac/PC you can get a VST host program and a VST plugins for AY-3-8910 PSG (or other plugins like various FM sound ones).
Specially, for only PSG, any VSt with just 1 OSC and square wave is enough. But you have ProtoPSG and Soft PSG VSTi's for more advanced options. For SCC, there's a VST, Chip32 that sounds fine.