I had recently picked up Famitracker and intend to use NSF files for music in a quest that I may or may not do. However, I find that Zelda Classic's NSF player does not support the VRC7 sound chip. Though not necessary, it would add a lot more variety to the sound. The VRC7 was only used in one game, LaGrange Point by Konami for the Famicom, so I could easily understand why it isn't supported already.
Don't get me wrong, I love MIDI, but the default square wave and saw wave are chorused ! That's not kosher.
I am happy that the NSF player supports VRC6 and can probably get by with that if I need to, but I would love to be able to use the VRC7's 2 operator FM synth.