Tandy 1000 Soundchip revisited: ASM programming example

In this tool-assisted education video, I create an assembler program that plays back several favourite NES songs using only the 3-channel noise PC speaker found in the Tandy 1000. A month ago I demonstrated the 3½-channel PC speaker of Tandy 1000. You can see and hear it in this video: I wrote that example in GW-BASIC, but everyone was left hanging over the following problem: GW-BASIC has certain limits. You cannot reproduce fine vibrato of NES songs in it, bec