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RTTTL has three parts, which are all separated by one colon each. All of them must be there.
Part 1 - The name of the ringtone, then a comma. This ringtone's name is defined as "HauntHouse" because the name cannot normally be longer than 10 characters or have a colon ":" character. Smart Messaging allows names up to 15 characters in length, and some applications processing RTTTL also do that.
Part 2 - The settings (here: d=4,o=5,b=108). "d=" says the default duration of a note is that much of a note. For example, "1" means a whole note, "2" means a half note and so on. "o=" says the default octave. "b=" says the tempo in beats per minute.
Part 3 - The notes. Each note is separated by a comma and shown in this order: the duration, a standard music note (a, b, c, d, e, f or g), and an octave. The default is used if no duration or octave is defined.
RTTTL is defined in a similar way to Music Macro Language, which many early microcomputers have in their BASIC implementations.
Adding a period (".") character to the end of a note increases the length of the note by half, which can be used to make dottedrhythm patterns.
Pitch
These pitches can be used:
P - rest or pause
A - A
A# - A♯ / B♭
B - B / C♭
C - C
C# - C♯ / D♭
D - D
D# - D♯ / E♭
E - E / F♭
F - F / E♯
F# - F♯ / G♭
G - G
G# - G♯ / A♭
Octaves
RTTTL has 4 octaves, starting from the A below middle C and going up four octaves, because cellphones could not play some tones audibly at the time it was made. These octaves are numbered from lowest pitch to highest pitch from 4 to 7.
The octave should be left out of the note to prevent rests or pauses in the pattern.
