I've spent the last couple of days working on one particular aspect of my
PhreakNet Asterisk Switch -- revertive pulse singalling for the simulation
I have of the Number 2 Crossbar switch which was prototyped but never put
into production.

I love the sound and concept of the revertive pulse signalling protocol. It's
just a thing of auditory beauty, and I certainly wanted my XB2 to use the
protocol for incoming calls: Since 3 of my other simulated switches are of the
ITT Pentaconta design, which actually supported RP Signalling (surprising
since the switch was not only not a Bell System design but was in fact
European in origin -- not sure on the use of RP there but I would imagine
it was uncommon) so this isn't entirely illogical of a setup.

Now, Asterisk has had a script for calculating RP for a while, and that
has actually been turned into a proper Asterisk module by InterLinked. Be
it the AGI script or the module, they work the same way -- sound files are
played in specific orders after the number of RP ticks to reach the desired
number are caluclated. Default audio is provided, but this audio is, quite
simply, too noisy for me. It just isn't the way I would imagine RP to this
particular switch sounding, given it is simulated to be in a suburban area,
as opposed to something like NYC where the original audio samples originated.

Long story short I used the timings in the original audio (that is, kept the
audio files the same length) and placed the audible ticks appropriately to
attempt to match the particular cadence of 1XB RP... and it worked fine first
try! I did have to reduce the volume on the audio to make it more how I want 
it to be but otherwise I nailed it.

Add in a proper "end" sound based on the real cut-to-ringing sound made by
the 1XB at the connections museum and it's damn near perfect.

I'm pretty proud of it all. The officec is 353 for those who decide to call
into PhreakNet and check it out.

I know, I didn't actually explain anything here, but there are resources out
there that do a far better job explaining the principle than I can -- I just
wanted to share my joy in creating custom audio that actually works out and
sounds accurate compared to the real phenomina, which is something that most
people would have never heard anything quite like these days -- it's a nuance
of the past that's lost in modernity, but sounds absolutely badass.

Right, enough rambling, time to publish and continue with my day.

~Chris