1 files changed, 7 insertions, 2 deletions

diff --git a/src/common.h b/src/common.h
index b688711..d78f11a 100644
--- a/src/common.h
+++ b/src/common.h
@@ -105,7 +105,7 @@ rgb15(u32 red, u32 green, u32 blue ) {
 #define COLOR_RED   rgb15(31, 0, 12)
 #define COLOR_BLUE  rgb15(2, 15, 30)
 #define COLOR_CYAN  rgb15(0, 30, 30)
-#define COLOR_GREY  rgb15(4, 4, 4)
+#define COLOR_GREY  rgb15(12, 12, 12)
 #define COLOR_BLACK rgb15(0, 0, 0)
 #define COLOR_WHITE rgb15(28, 28, 28)
 
@@ -594,9 +594,14 @@ sound_volume(SoundChannel channels, u8 volume) {
 #define SOUND_SQUARE_LEN(N)      (N)
 #define SOUND_SQUARE_DUTY(N)     ((N) << 0x6)
 #define SOUND_SQUARE_ENV_TIME(N) ((N) << 0x8)
-#define SOUND_SQUARE_ENV_INC(N)  ((N) << 0xB)
+#define SOUND_SQUARE_ENV_DIR(N)  ((N) << 0xB)
 #define SOUND_SQUARE_ENV_VOL(N)  ((N) << 0xC)
 
+// DMG square 1 sweep control bits.
+#define SOUND_SWEEP_NUMBER(N) (N)
+#define SOUND_SWEEP_DIR(N)    ((N) << 0x3)
+#define SOUND_SWEEP_TIME(N)   ((N) << 0x4)
+
 // DMG square frequency bits.
 #define SOUND_SQUARE_TIMED (1 << 0xE)
 #define SOUND_SQUARE_RESET (1 << 0xF)