The RTX Ringtone SpecificationThe RTX Ringtone Specification
An RTX file is a text file, containing the ringtone name, a control section and 
a section containing a comma separated sequence of ring tone commands. The RTX 
ringtone description format is designed to be backward compatible with RTTTL, 
but offers extensions in line with the Nokia Smart Messaging standard. White 
space must be ignored by any reader application.
Example: 
AxelF:d=4,o=5,b=125:32p,8g,8p,16a#.,8p,16g,16p,16g,8c6, 
8g,8f,8g,8p,16d.6,8p,16g,16p,16g,8d#6,8d6,8a#,8g,8d6,8g6, 
16g,16f,16p,16f,8d,8a#,2g,p,SS,16f6,8d6,8c6,8a#,g,8a#.,16g, 
16p,16g,8c6,8g,8f,g,8d.6,16g,16p,16g,8d#6,8d6,8a#,8g,8d6, 
8g6,16g,16f,16p,16f,8d,8a#,2g
This file describes a ringtone whose name is 'AxelF'. The control section sets 
the beats per second at 125, the default note length at 4, and the default scale 
on 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" | "s"
    ; Valid in control section: o=default scale, d=default duration, b=default 
    beats per minute, s=style
    ; Valid in tone section: o, b, s
    <control-value> := <char>+ ; dependent on control-name
        ; if not specified, defaults are 4=duration, 6=scale, 
63=beats-per-minute
        ; styles are S=Staccato, N=Natural, C=Continuous
        ; 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#" | "H" 
      <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
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