Feat: refactoring codebase

docs/engine/words.md

@@ -0,0 +1,43 @@
+# Words & Sounds
+
+Word definitions let you abstract sound design into reusable units.
+
+## Defining Sounds
+
+```forth
+: lead "saw" s 0.3 gain 1200 lpf ;
+```
+
+Use it with different notes:
+
+```forth
+c4 note lead .
+e4 note lead .
+```
+
+## Self-Contained Words
+
+Include the emit to make the word play directly:
+
+```forth
+: kk "kick" s 1 decay . ;
+: hh "hihat" s 0.5 gain 0.5 decay . ;
+```
+
+Steps become simple:
+
+```forth
+kk
+0.5 at hh
+```
+
+## Effect Presets
+
+```forth
+: dark 800 lpf 0.6 lpq ;
+: wet 0.7 verb 8 verbdiff ;
+```
+
+```forth
+c4 note saw s dark wet .
+```