Differences

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--- lynx:abcmusic [2021/01/25 11:59] – Karri Kaksonen
+++ lynx:abcmusic [2023/01/26 06:06] (current) – external edit 127.0.0.1
@@ Line 61: / Line 61: @@
 When we combine these three sounds we get an irritating background tune that will annoy you just as much as the Flappy Bird game.
-In Atari Lynx we use proprietary ABC codes to set the hardware for the tune. I try to describe the recognized operators.
+In Atari Lynx we use proprietary ABC codes to set the hardware for the tune. You can use these codes for changing an instrument on the fly also. Perhaps the first phrase is played by a flute and the 2nd by piano. I try to describe the recognized operators here.
+''
-''Tempo:
+T10 - Tempo - number of VBL interrupts that makes up a single time slot. The smaller you set this number, the faster the music plays.
-T10 - number of VBL interrupts that makes up a single time slot. The smaller you set this number, the faster the music plays.
-Waveform:
 X7 - waveform. This describes how the feedback links are connected to the polyphonic sound generator. - I don't get it either.
-Square wave or not:
+I0 - a letter I plus zero means a square wave, a one means a triangle wave. Triange has a smoother sound.
-I0 - a letter I plus zero means a square wave, a one means a triangle wave
+V100 - volume. Max is 127, min is 0
+O2 - octave from 0 to 5. 5 is very low and 0 very high.
+R0 - envelope ramp up
+H0 - envelope hold note
+K3 - envelope ramp down
+These envelope parameters apply to the volume of a note.
 ''
 In ABCmusic we need to code every one of these 3 melodies to a string. You can omit white space and bar lines without repeats to save space.
+''
-''char *melody = "G2 z2 g2 z2 | G2 z2 g2 z2 | G2 g2 G2 g2...";
+char *melody = "X7I1V127T10R6H10K1O2 G2 z2 g2 z2 | G2 z2 g2 z2 | G2 g2 G2 g2...";
-char *bass = "D,4 G,4 | D,4 G,4 | D,4 G,4 | D,4 G,4...";
+char *bass = "X7O2I1V100T10R0H0K3 D,4 G,4 | D,4 G,4 | D,4 G,4 | D,4 G,4...";
-char *percussion = "D2 G G D2 G2 | D2 G G D2 G2 | D2 G G D2 G2..."
+char *percussion = "X7O4I1V40T10R0H0K6 D2 G G D2 G2 | D2 G G D2 G2 | D2 G G D2 G2..."
 ''
 After this we can play the combined tune by making a call to abcplay()
+''
 abcplay(0, melody);
 abcplay(1, bass);
 abcplay(2, percussion);
+''
-This is how the note part works. But we still have to choose the instrument, the tempo and the volume of the music.
+The abcmusic drivers are available in different flavours:
+  * bll
+  * cc65
+  * newcc65
+  * in C-code
+[[https://bitbucket.org/atarilynx/lynx/src/master/contrib/abcmusic|abcmusic]]
 {{ :lynx:chickendance.mp3 |}}