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+====== Custom music sequence ======
+For Super Mario 64 hacking, there are several ways to create a custom music sequence.
+===== Text file (decomp) =====
+If you are working with the decompilation project, you may write down a music sequence in assembly. The decompilation project provides macros that helps writing music files. See includes/seq_marcos.inc for available commands.
+The following code snippet is a short version of the popular Tetris theme. Put this file into the sequences folder (e.g. sound/sequences/us), give it a unique hexadecimal ID in the filename or replace an existing track. Use .s (assembly) for the file extension. In sound/sequences.json you need to choose a sound bank to use. Since this snippet is using instrument 0 only, it works well with most sound banks by default.
+<code asm 23_custom_tetris.s>
+.include "seq_macros.inc"
+.section .rodata
+.align 0
+# instruments to use
+.eqv INSTR_MELODY, 0
+.eqv INSTR_BASS, 0
+# note values
+.eqv WHOLE, 192
+.eqv QUARTER, 48
+.eqv EIGHTH, 24
+.eqv QUARTER_DOTTET, 72
+.eqv HALF, 96
+# note pitches
+.eqv A4, 48
+.eqv G4, 46
+.eqv F4, 44
+.eqv E4, 43
+.eqv D4, 41
+.eqv C4, 39
+.eqv B3, 38
+.eqv A3, 36
+.eqv E3, 31
+.eqv D3, 29
+.eqv B2, 26
+.eqv A2, 24
+.eqv E2, 19
+sequence_start: # this label is required at the beginning of the sequence
+seq_settempo 125 # in BPM (beats per minute)
+seq_setvol 127 # 0..255
+seq_initchannels 0x03 # bitmask; use channel 0 and 1
+seq_startchannel 0, .channel0 # we play melody here
+seq_startchannel 1, .channel1 # we play bass here
+seq_delay WHOLE * 8
+seq_jump sequence_start # endless loop
+seq_end
+.channel0:
+chan_largenoteson
+chan_setvol 127
+chan_setinstr INSTR_MELODY
+chan_setlayer 0, .layer_melody1
+chan_delay WHOLE * 4
+chan_setlayer 0, .layer_melody2
+chan_delay WHOLE * 4
+chan_end
+.channel1:
+chan_largenoteson
+chan_setvol 127
+chan_setinstr INSTR_BASS
+chan_setlayer 0, .layer_bass1
+chan_delay WHOLE * 4
+chan_setlayer 0, .layer_bass2
+chan_delay WHOLE * 4
+chan_end
+.layer_melody1:
+layer_note1 E4, QUARTER, 100
+layer_note1 B3, EIGHTH, 100
+layer_note1 C4, EIGHTH, 100
+layer_note1 D4, QUARTER, 100
+layer_note1 C4, EIGHTH, 100
+layer_note1 B3, EIGHTH, 100
+layer_note1 A3, QUARTER_DOTTET, 100
+layer_note1 C4, EIGHTH, 100
+layer_note1 E4, QUARTER, 100
+layer_note1 D4, EIGHTH, 100
+layer_note1 C4, EIGHTH, 100
+layer_note1 B3, QUARTER_DOTTET, 100
+layer_note1 C4, EIGHTH, 100
+layer_note1 D4, QUARTER, 100
+layer_note1 E4, QUARTER, 100
+layer_note1 C4, QUARTER, 100
+layer_note1 A3, QUARTER, 100
+layer_note1 A3, HALF, 100
+layer_end
+.layer_melody2:
+layer_delay EIGHTH
+layer_note1 D4, QUARTER, 100
+layer_note1 F4, EIGHTH, 100
+layer_note1 A4, QUARTER, 100
+layer_note1 G4, EIGHTH, 100
+layer_note1 F4, EIGHTH, 100
+layer_note1 E4, QUARTER_DOTTET, 100
+layer_note1 C4, EIGHTH, 100
+layer_note1 E4, QUARTER, 100
+layer_note1 D4, EIGHTH, 100
+layer_note1 C4, EIGHTH, 100
+layer_note1 B3, QUARTER, 100
+layer_note1 B3, EIGHTH, 100
+layer_note1 C4, EIGHTH, 100
+layer_note1 D4, QUARTER, 100
+layer_note1 E4, QUARTER, 100
+layer_note1 C4, QUARTER, 100
+layer_note1 A3, QUARTER, 100
+layer_note1 A3, QUARTER, 100
+layer_delay QUARTER
+layer_end
+.layer_bass1:
+layer_call .layer_fn_bass_e
+layer_call .layer_fn_bass_a
+layer_call .layer_fn_bass_e
+layer_call .layer_fn_bass_a
+layer_end
+.layer_bass2:
+layer_call .layer_fn_bass_d
+layer_call .layer_fn_bass_a
+layer_call .layer_fn_bass_e
+layer_call .layer_fn_bass_a
+layer_end
+.layer_fn_bass_e:
+layer_loop 4
+layer_note1 E2, EIGHTH, 100
+layer_note1 B2, EIGHTH, 100
+layer_loopend
+layer_end
+.layer_fn_bass_a:
+layer_loop 4
+layer_note1 A2, EIGHTH, 100
+layer_note1 E3, EIGHTH, 100
+layer_loopend
+layer_end
+.layer_fn_bass_d:
+layer_loop 4
+layer_note1 D3, EIGHTH, 100
+layer_note1 A3, EIGHTH, 100
+layer_loopend
+layer_end
+</code>

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