diff options
Diffstat (limited to 'macros/audio_macros.asm')
| -rwxr-xr-x | macros/audio_macros.asm | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/macros/audio_macros.asm b/macros/audio_macros.asm index 620b61ad..643114da 100755 --- a/macros/audio_macros.asm +++ b/macros/audio_macros.asm @@ -32,11 +32,13 @@ ENDM ; arguments: length [0, 7], pitch change [-7, 7] ; length: length of time between pitch shifts +; sometimes used with a value >7 in which case the MSB is ignored ; pitch change: positive value means increase in pitch, negative value means decrease in pitch ; small magnitude means quick change, large magnitude means slow change +; in signed magnitude representation, so a value of 8 is the same as (negative) 0 pitch_sweep: MACRO db $10 - IF \2 <= 0 + IF \2 < 0 db (\1 << 4) | (%1000 | (\2 * -1)) ELSE db (\1 << 4) | \2 @@ -46,6 +48,7 @@ ENDM ; arguments: length [0, 15], volume [0, 15], fade [-7, 7], frequency ; fade: positive value means decrease in volume, negative value means increase in volume ; small magnitude means quick change, large magnitude means slow change +; in signed magnitude representation, so a value of 8 is the same as (negative) 0 square_note: MACRO db $20 | \1 IF \3 < 0 @@ -59,6 +62,7 @@ ENDM ; arguments: length [0, 15], volume [0, 15], fade [-7, 7], frequency ; fade: positive value means decrease in volume, negative value means increase in volume ; small magnitude means quick change, large magnitude means slow change +; in signed magnitude representation, so a value of 8 is the same as (negative) 0 noise_note: MACRO db $20 | \1 IF \3 < 0 @@ -109,6 +113,7 @@ ENDM ; arguments: speed [0, 15], volume [0, 15], fade [-7, 7] ; fade: positive value means decrease in volume, negative value means increase in volume ; small magnitude means quick change, large magnitude means slow change +; in signed magnitude representation, so a value of 8 is the same as (negative) 0 note_type: MACRO db $D0 | \1 IF \3 < 0 |