Fix: update docs about snd

docs/tutorials/soundfont.md

@@ -11,9 +11,9 @@ Drop an `.sf2` file into one of your samples directories. The engine finds and l
 Use `gm` as the sound source. The `n` parameter selects a program by name or number (0-127):
 
 ```forth
-gm s piano n .              ;; acoustic piano
-gm s strings n c4 note .    ;; strings playing middle C
-gm s 0 n e4 note .          ;; program 0 (piano) playing E4
+gm snd piano n .              ;; acoustic piano
+gm snd strings n c4 note .    ;; strings playing middle C
+gm snd 0 n e4 note .          ;; program 0 (piano) playing E4
 ```
 
 ## Drums
@@ -21,10 +21,10 @@ gm s 0 n e4 note .          ;; program 0 (piano) playing E4
 Drums live on a separate bank. Use `drums` or `percussion` as the `n` value. Each MIDI note triggers a different instrument:
 
 ```forth
-gm s drums n 36 note .      ;; kick
-gm s drums n 38 note .      ;; snare
-gm s drums n 42 note .      ;; closed hi-hat
-gm s percussion n 49 note . ;; crash cymbal
+gm snd drums n 36 note .      ;; kick
+gm snd drums n 38 note .      ;; snare
+gm snd drums n 42 note .      ;; closed hi-hat
+gm snd percussion n 49 note . ;; crash cymbal
 ```
 
 ## Envelope
@@ -32,8 +32,8 @@ gm s percussion n 49 note . ;; crash cymbal
 The soundfont embeds ADSR envelope data per preset. The engine applies it automatically. Override any parameter explicitly:
 
 ```forth
-gm s piano n 0.01 attack 0.3 decay .
-gm s strings n 0.5 attack 2.0 release .
+gm snd piano n 0.01 attack 0.3 decay .
+gm snd strings n 0.5 attack 2.0 release .
 ```
 
 If you set `attack`, `decay`, `sustain`, or `release`, your value wins. Unspecified parameters keep the soundfont default.
@@ -43,9 +43,9 @@ If you set `attack`, `decay`, `sustain`, or `release`, your value wins. Unspecif
 All standard engine parameters work on GM voices. Filter, distort, spatialize:
 
 ```forth
-gm s bass n 800 lpf 0.3 verb .
-gm s epiano n 0.5 delay 1.5 distort .
-gm s choir n 0.8 pan 2000 hpf .
+gm snd bass n 800 lpf 0.3 verb .
+gm snd epiano n 0.5 delay 1.5 distort .
+gm snd choir n 0.8 pan 2000 hpf .
 ```
 
 ## Preset Names
@@ -79,22 +79,22 @@ A simple GM drum pattern across four steps:
 
 ```forth
 ;; step 1: kick
-gm s drums n 36 note .
+gm snd drums n 36 note .
 
 ;; step 2: closed hat
-gm s drums n 42 note 0.6 gain .
+gm snd drums n 42 note 0.6 gain .
 
 ;; step 3: snare
-gm s drums n 38 note .
+gm snd drums n 38 note .
 
 ;; step 4: closed hat
-gm s drums n 42 note 0.6 gain .
+gm snd drums n 42 note 0.6 gain .
 ```
 
 Layer piano chords with randomness:
 
 ```forth
-gm s piano n
+gm snd piano n
 c4 e4 g4 3 choose note
 0.3 0.8 rand gain
 0.1 0.4 rand verb
@@ -104,7 +104,7 @@ c4 e4 g4 3 choose note
 A bass line with envelope override:
 
 ```forth
-gm s bass n
+gm snd bass n
 c2 e2 g2 a2 4 cycle note
 0.01 attack 0.2 decay 0.0 sustain
 .