How to create & add AY sound FX to MPAGD?

[ultranarwhal]

I'm trying to convert my Spectrum game to Amstrad CPC using MPAGD, but currently it has no sound FX as I used the beeper on Speccy.

Does anyone know what tool to use to generate AY FX and how to point MPAGD scripts to generated Sound 0, Sound 1, Sound 2 etc.  I tried importing from AGD 4.7 a simple test tape that used Sound 0 to MPAGD, but still no sound on CPC.

Thanks

[Jonathan Cauldwell]

Sounds are presently disabled but it's easy enough to re-enable them with 3 changes to the CPC engine. The call to the sound routine has been commented out and just needs re-inserting. This is how to do it:

In the file EngineCPC.asm change the delay routine from this:

delay  push bc             ; store loop counter.
      call vsync          ; pause for a frame.
;       call plsnd          ; time to play sound.
      pop bc              ; restore counter.
      dec b               ; one less iteration.
      ret z               ; done.
      push bc             ; store loop counter again.
      call vsync          ; pause for a frame.
      pop bc              ; restore counter.
      djnz delay          ; repeat.
      ret


to this:

delay  push bc             ; store loop counter.
      call vsync          ; pause for a frame.
      call plsnd          ; time to play sound.
      pop bc              ; restore counter.
      dec b               ; one less iteration.
      ret z               ; done.
      push bc             ; store loop counter again.
      call vsync          ; pause for a frame.
      pop bc              ; restore counter.
      djnz delay          ; repeat.
      ret


Change these 2 lines:

;vsync5 call plsnd          ; play sound.
vsync5 jp proshr           ; shrapnel and stuff.


to look like this:

vsync5 call plsnd          ; play sound.
      jp proshr           ; shrapnel and stuff.


and finally, change mloop from this:

mloop  call vsync          ; synchronise with display.

      ld ix,sprtab        ; address of sprite table, even sprites.
      call dspr           ; display even sprites.

;       call plsnd          ; play sounds.
      call vsync          ; synchronise with display.
      ld ix,sprtab+TABSIZ ; address of first odd sprite.


to this:

mloop  call vsync          ; synchronise with display.

      ld ix,sprtab        ; address of sprite table, even sprites.
      call dspr           ; display even sprites.

      call plsnd          ; play sounds.
      call vsync          ; synchronise with display.
      ld ix,sprtab+TABSIZ ; address of first odd sprite.


I'll put these back in to the Spectrum and CPC versions for the next release, maybe there needs to be a way of toggling AY sounds on or off as many game designers prefer to use AY music instead.

[djcaye]

I have the same issue. i do not have comments in the lines that you tell us, but SOUND does not work in CPC (version of MPAGD 0.7.10)

Regards!!

[ramon]

Nov 10, 2022 21:22:23 GMT djcaye said:

I have the same issue. i do not have comments in the lines that you tell us, but SOUND does not work in CPC (version of MPAGD 0.7.10)

Regards!!

Try this: User routine for CPC Music and FX or this: Sound mod
Ask me all you need.

[djcaye]

Hola Ramón y gracias!!

Lo he seguido (para crear música) pero, haciendo los pasos, no lo he conseguido.

Descomprimo la ultima versión, Creo la pista de musica y la exporto a ASM, la guardo en la carpeta Resources, cargo la rutina de usuario, y pongo USER 1 en el main loop, pero nada...!!!

Lo más, escucho un zumbido cuando cargo todo!!!

A ver si lo soluciono!!

----

Hi Ramón and thanks.

I follow your tutorial but it does not work for me.

I uncompress the last version, I have made the music track and export as ASM, I put it in "resources" folder, also load the user routine and finally put USER 1 in main loop, but nothing happens... 

I only have a small buzz during the game (noise, I mean).

Regards!!

[ramon]

Rutina User CPC:

The last link at the end of the conversation thread contains the correct version. With it you don't need any calls in the mainloop event.
Use the command USER 0 for the first song, USER 1 for the next, and so on. Do it at any time you want, it will start the player automatically.
Use USER 101 for effect 1 and USER 102 for effect 2, and so on.
Use USER 18 to Stop the player at any time.
Every time you call the USER n command the player is started again, this is a common error, check it out. Luck.