Hi, I'm the creator of this FM Tracker thingy. 
As my friend Akira was saying, I decided to release the source code because I won't be developing it any further, but I strongly encourage anyone interested to do it instead. Therefore, feel free to ask for anything you need to know about the current state of the code and I'll do my best to help, even though I don't code in Pascal anymore.
Also, here's a video of v0.11 running on DOSBox v0.74, which fixes a few bugs and also shows songs playing at their normal speed:
https://www.youtube.com/watch?v=xQQvtjI7THg
PS: There's no Mac port coming unless somebody else decides to do it, but in the meantime you could try running it in an MS-DOS emulator.