This port sounds nice. However, it has some issues in terms of optimization, the biggest being the unnecessary use of $FA $03, or the amplify command. That command is useful for when an instrument is already at a very high volume but still isn't loud enough; however, here, you've either used a high amplify value with a low volume, or vice versa, which makes most (if not all) of the commands useless, since you could directly define a higher volume with the v command and save a ton of space.
As the AddmusicK readme states in the description for the $FA $03 command:
Originally posted by AddmusicK readme
Multiplies the volume of the current channel by this value + 1. 0 will not modify the volume, whereas FF will (just shy of) double it. Be warned of clipping, however, as SMW's engine was not built to assume high volumes. In other words, don't use this to make your song louder; use it if a specific instrument or something is already playing at max volume and still isn't loud enough.