Differences
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| lynx:abcmusic [2021/01/25 08:37] – Karri Kaksonen | lynx:abcmusic [2023/01/26 06:06] (current) – external edit 127.0.0.1 | ||
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| c2 B2 B4 | z2 d2 d2 c2 | c2 B2 B4 |1 z2 A2 G2 F2 | | c2 B2 B4 | z2 d2 d2 c2 | c2 B2 B4 |1 z2 A2 G2 F2 | | ||
| w: to the right. We're ha-ving fun to-night. Let's dance some | w: to the right. We're ha-ving fun to-night. Let's dance some | ||
| - | " | + | " |
| - | w: more. Then we all Let's dance some more. With a lit-tle bit of more. | + | w: more. Then we all Let's dance some more. With a lit-tle bit of |
| + | | ||
| + | w: dance. | ||
| </ | </ | ||
| - | Once we have the melody working we have also defined the structure of the music. We now know how many bars there is and how the music phrases will repeat. | + | Once we have the melody working we have also defined the structure of the music. We now know how many bars there is and how the music phrases will repeat. This implementation does not parse segments and coda properly so the realtime playback is different from what I wrote. Sorry about it. |
| Then we could have a look at the chords. There is two different chords in this tune. The chord " | Then we could have a look at the chords. There is two different chords in this tune. The chord " | ||
| <abc> | <abc> | ||
| Line 59: | 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. | 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. 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. | ||
| + | '' | ||
| + | T10 - Tempo - number of VBL interrupts that makes up a single time slot. The smaller you set this number, the faster the music plays. | ||
| + | X7 - waveform. This describes how the feedback links are connected to the polyphonic sound generator. - I don't get it either. | ||
| + | I0 - a letter I plus zero means a square wave, a one means a triangle wave. Triange has a smoother sound. | ||
| + | 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. | 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 |
| - | char *bass = "D,4 G,4 | D,4 G,4 | D,4 G,4 | D,4 G, | + | char *bass = "X7O2I1V100T10R0H0K3 |
| - | char *percussion = "D2 G G D2 G2 | D2 G G D2 G2 | D2 G G D2 G2..." | + | char *percussion = "X7O4I1V40T10R0H0K6 |
| + | '' | ||
| After this we can play the combined tune by making a call to abcplay() | After this we can play the combined tune by making a call to abcplay() | ||
| + | '' | ||
| abcplay(0, melody); | abcplay(0, melody); | ||
| abcplay(1, bass); | abcplay(1, bass); | ||
| abcplay(2, percussion); | 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:// | ||
| {{ : | {{ : | ||