Arturo Ragozini sent us an update of Apology MSX, a 6-channel PSG replayer. This new version includes an Excel sheet that can be used as a tracker. The tracker instantly shows the estimated error rate in the accuracy of the frequency output, helping you to make your 6-channel PSG tune sound as good as possible. After creating a song, you can paste the music data from the Excel sheet into the source code (apo.asm) and compile it using SjASM
Relevant link: Apology MSX