RTTTL Format Specifications (rescued from merwin.bespin.org)

RTTTL (RingTone Text Transfer Language) is the primary format used to
distribute ringtones for Nokia phones. An RTTTL file is a text file,
containing the ringtone name, a control section and a section containing
a comma separated sequence of ring tone commands. Whitespace must be ignored
by any reader application. 

Example: 
Simpsons:d=4,o=5,b=160:32p,c.6,e6,f#6,8a6,g.6,e6,c6,8a,8f#,8f#,8f#,2g

This file describes a ringtone whose name is 'Simpsons'. The control section 
sets the beats per minute at 160, the default note length as 4, and the
default scale as Octave 5. 
<RTX file> := <name> ":" [<control section>] ":" <tone-commands>

<name> := <char> ; maximum name length 10 characters

<control-section> := <control-pair> ["," <control-section>]

<control-pair> := <control-name> ["="] <control-value>

<control-name> := "o" | "d" | "b"
; Valid in control section: o=default scale, d=default duration, b=default BPM
; if not specified, defaults are 4=duration, 6=scale, 63=BPM
; any unknown control-names must be ignored

<tone-commands> := <tone-command> ["," <tone-commands>]

<tone-command> :=<note> | <control-pair>

<note> := [<duration>] <note> [<scale>] [<special-duration>] <delimiter>

<duration> := "1" | "2" | "4" | "8" | "16" | "32" 
; duration is divider of full note duration, eg. 4 represents a quarter note

<note> := "P" | "C" | "C#" | "D" | "D#" | "E" | "F" 
              | "F#" | "G" | "G#" | "A" | "A#" | "B"

<scale> :="4" | "5" | "6" | "7"
; Note that octave 4: A=440Hz, 5: A=880Hz, 6: A=1.76 kHz, 7: A=3.52 kHz
; The lowest note on the Nokia 61xx is A4, the highest is B7

<special-duration> := "." ; Dotted note

; End of specification