diff --git a/Source/Apps/Tune/hbios.inc b/Source/Apps/Tune/hbios.inc
index cba06045..a7d3351e 100644
--- a/Source/Apps/Tune/hbios.inc
+++ b/Source/Apps/Tune/hbios.inc
@@ -7,6 +7,6 @@ BF_SND		.EQU	$50
 BF_SNDRESET	.EQU	BF_SND + 0	; RESET SOUND SYSTEM
 BF_SNDVOL	.EQU	BF_SND + 1	; REQUEST SOUND VOL - L CONTAINS VOLUME (255 MAX, 0 SILENT) - SCALED AS REQUIRED BY DRIVER (EG: MAPS TO JUST 4 BIT RESOLUTION FOR SN76489)
 BF_SNDPRD	.EQU	BF_SND + 2	; REQUEST SOUND PERIOD - HL CONTAINS DRIVER SPECIFIC VALUE
-BF_SNDNOTE	.EQU	BF_SND + 3	; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS QUARTER NOTE
+BF_SNDNOTE	.EQU	BF_SND + 3	; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS AN EIGHTH NOTE
 BF_SNDPLAY	.EQU	BF_SND + 4	; INITIATE THE REQUESTED SOUND COMMAND
 BF_SNDQUERY	.EQU	BF_SND + 5	; E IS SUBFUNCTION
diff --git a/Source/HBIOS/audio.inc b/Source/HBIOS/audio.inc
index fcb686c7..91352a3e 100644
--- a/Source/HBIOS/audio.inc
+++ b/Source/HBIOS/audio.inc
@@ -45,7 +45,7 @@ AUD_SCALE	.EQU	3
 ; ON ENTRY, DE IS ADDRESS OF NOTE TABLE, HL IS NOTE TO PLAY
 ; NOTE VALUE 0 MEANS B0b/A0# IN OCTAVE 0 WHICH IS THE FIRST ENTRY
 ; OF THE NOTE TABLE.  THE NOTE TABLE REPRESENTS THE FREQUENCIES
-; FOR 1 FULL OCTAVE IN QUARTER NOTES.  SINCE THERE ARE 12 NOTES
+; FOR 1 FULL OCTAVE IN EIGHTH NOTES.  SINCE THERE ARE 12 NOTES
 ; IN AN OCTAVE, THE TABLE HAS 48 ENTRIES FOR ALL QUARTER NOTES.
 ;
 ; ON EXIT, HL CONTAINS THE PERIOD VALUE TO PROGRAM INTO THE PSG
diff --git a/Source/HBIOS/hbios.inc b/Source/HBIOS/hbios.inc
index 3c7a42f5..c58fbf39 100644
--- a/Source/HBIOS/hbios.inc
+++ b/Source/HBIOS/hbios.inc
@@ -71,7 +71,7 @@ BF_SND		.EQU	$50
 BF_SNDRESET	.EQU	BF_SND + 0	; RESET SOUND SYSTEM
 BF_SNDVOL	.EQU	BF_SND + 1	; REQUEST SOUND VOL - L CONTAINS VOLUME (255 MAX, 0 SILENT) - SCALED AS REQUIRED BY DRIVER (EG: MAPS TO JUST 4 BIT RESOLUTION FOR SN76489)
 BF_SNDPRD	.EQU	BF_SND + 2	; REQUEST SOUND PERIOD - HL CONTAINS DRIVER SPECIFIC VALUE
-BF_SNDNOTE	.EQU	BF_SND + 3	; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS QUARTER NOTE
+BF_SNDNOTE	.EQU	BF_SND + 3	; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS AN EIGHTH NOTE
 BF_SNDPLAY	.EQU	BF_SND + 4	; INITIATE THE REQUESTED SOUND COMMAND
 BF_SNDQUERY	.EQU	BF_SND + 5	; E IS SUBFUNCTION
 BF_SNDDURATION	.EQU	BF_SND + 6	; REQUEST DURATION HL MILLISECONDS