Feat: docs should be good enough

docs/tutorials/at.md

@@ -13,10 +13,17 @@ Every step has a duration. By default, sounds emit at the very start of that dur
 Push multiple values before calling `at` to get multiple emits from a single `.`:
 
 ```forth
-0 0.5 at kick s .       ;; two kicks: one at start, one at midpoint
-0 0.25 0.5 0.75 at hat s .   ;; four hats, evenly spaced
+0 0.5 at kick s .
 ```
 
+Two kicks: one at start, one at midpoint.
+
+```forth
+0 0.25 0.5 0.75 at hat s .
+```
+
+Four hats, evenly spaced.
+
 The deltas persist across multiple `.` calls until `clear` or a new `at`:
 
 ```forth
@@ -33,10 +40,10 @@ Without `arp`, deltas multiply with polyphonic voices. If you have 3 notes and 2
 
 ```forth
 0 0.5 at
-c4 e4 g4 note sine s .   ;; 6 emits: 3 notes x 2 deltas
+c4 e4 g4 note 1.5 decay sine s .
 ```
 
-This is a chord played twice per step.
+6 emits: 3 notes x 2 deltas. A chord played twice per step.
 
 ## 1:1 Pairing: at With arp
 
@@ -44,16 +51,20 @@ This is a chord played twice per step.
 
 ```forth
 0 0.33 0.66 at
-c4 e4 g4 arp note sine s .   ;; c4 at 0, e4 at 0.33, g4 at 0.66
+c4 e4 g4 arp note 0.5 decay sine s .
 ```
 
+C4 at 0, E4 at 0.33, G4 at 0.66.
+
 If the lists differ in length, the shorter one wraps around:
 
 ```forth
 0 0.25 0.5 0.75 at
-c4 e4 arp note sine s .       ;; c4, e4, c4, e4 at 4 time points
+c4 e4 arp note 0.3 decay sine s .
 ```
 
+C4, E4, C4, E4 — the shorter list wraps to fill 4 time points.
+
 This is THE key distinction. Without `arp`: every note at every time. With `arp`: one note per time slot.
 
 ## Generating Deltas
@@ -89,12 +100,18 @@ Geometric spacing via `geom..`:
 Wrap `at` expressions in quotations for conditional timing:
 
 ```forth
-( 0 0.25 0.5 0.75 at ) 2 every    ;; 16th-note hats every other bar
+( 0 0.25 0.5 0.75 at ) 2 every
 hat s .
+```
 
-( 0 0.5 at ) 0.5 chance           ;; 50% chance of double-hit
+16th-note hats every other bar.
+
+```forth
+( 0 0.5 at ) 0.5 chance
 kick s .
 ```
 
+50% chance of double-hit.
+
 When the quotation doesn't execute, no deltas are set -- you get the default single emit at beat start.