Audio Sounds Music

Audio Sounds Music

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flowchart TD
  step["Party step / UI pump"] --> beep{"Walk Beep<br/>flag -$79AF?"}
  beep -- on --> thunk["JSR -$7FD4(A4)<br/>sound dispatch"]
  beep -- off --> silent["(no click)"]
  snd{"Sounds master<br/>flag -$79B0?"} --> thunk
  thunk --> dev["audio.device<br/>9 named channels"]
  ctrl["Controls menu keys 1-4"] -.toggles.-> snd
  ctrl -.toggles.-> beep

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MM2 on Amiga routes playback through the standard audio.device driver. There is no separate music.dat in the shipped file set — samples and music live inside the executable / overlay segments and are triggered through engine thunks bound at startup.

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Player-facing controls

The in-game Controls menu (title string Controls in the code hunk) exposes four toggles keyed 1–4 (0x31–0x34). Handler cluster around 0x13DEC in mm2.capstone.asm:

Key	Option	Runtime byte (A4)	Behaviour
1	Sounds	-$79B0 ($8650)	Toggles bit 0 (bchg @ 0x13F6C) — master SFX on/off
2	Walk Beep	-$79AF ($8651)	Toggles bit 0 (bchg @ 0x13F78) — footstep click on map move
3	Disposition	-$79AE ($8652)	Cycles 0…3 (addq @ 0x13F84, wraps at 3) — AI mood label from table A4-$6D70
4	Delay	-$79AD ($8653)	Cycles 0…9 (addq @ 0x13F9A, wraps at 9) — text/animation pacing

Menu copy (code hunk ~0x14026):

Controls
1) Sounds       /
2) Walk Beep    /
3) Disposition:
4) Delay
Press 1-4 to toggle
ON / OFF

-$83F8 prints the current ON/OFF or disposition line; -$839E prints delay as a decimal digit ('0'..'9' + 0x30).

Sample channel names

Embedded labels (code hunk ~0x6F88):

• Audio zero … Audio eight (nine named channels)
• Plus Audio one … Audio eight as alternate spellings in the same block

These names are diagnostic / table labels for the sound dispatcher, not DOS filenames. The driver string audio.device sits nearby (~0x72B6).

When sounds fire (partial trace)

Site	Thunk	Likely use
0x6F48	JSR -$7FD4(A4)	After overland/dungeon party step when map coords change — gated by walk-beep flag
0x1250, 0x52A2, 0x573E, …	same thunk	Session refresh, UI mode changes, other pumps
Combat block	(TBD)	Flavour text references sword clashes; exact SFX index not fully mapped

The thunk at -$7FD4 is not the same as the one-shot engine init at -$802C (0x052CA / 0x01278 region — binds the whole A4 callback table including audio).

Music & ambience (strings only)

str.dat (decoded) includes scene prose, not driver calls, e.g.:

• "Children's laughter, merry music and growls of vicious animals emulate from …"
• "The sound of clashing swords"

No ProTracker .mod path string appears in the main binary scan; music is likely embedded PCM / custom bank playback through the same audio layer as SFX.

Related globals

A4 offset	Data offset	Role
-$79B0	$8650	Sounds enabled (bit 0)
-$79AF	$8651	Walk beep enabled (bit 0)
-$79AE	$8652	Disposition index 0–3
-$79AD	$8653	Delay index 0–9
-$79AC	$8654	Screen/mode id mirror (saved with controls UI)

Open items

• Map each Audio N channel index to sample data offsets in the hunk / disk layout.
• Confirm combat hit / spell / victory SFX entry points (likely -$7FD4 with channel arg).
• Determine whether “music” is one long channel or streamed chunks on area entry.

See also

• Startup and Init — 802C engine bind
• Party and Session — display/audio setup mention
• Full Analysis §6.2 engine thunks
• Open Questions

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See also

Page	Why
Main Loop and Map	World simulation
RE Tools	Audio export scripts