Thanks for all the comments on my first post.  Your feedback has been a big help in figuring out what features should be included in a new controller.  Keep the ideas coming!

I've lately had an itch to write posts to a blog describing what's on my workbench to do with repeater controllers and repeater site infrastructure -- if I can tear myself away from the workbench long enough to write it ;-)  I'll try to keep my blog posts on-topic and a quick read.  

So, where to start.

When building a custom audio library from individual words or phrases, it's useful to be able to quickly play those words from the raw files stored on your Windows PC instead of going through the entire process of building and downloading a custom audio library to the 7330 only to find it doesn't work.  The way most of us play a custom word on Windows is to run Audacity, import the file, then play it. (See 7330 manual page 23-13.)

It can be even simpler to play a word with SoX.  (See page 23-11.)  Normally, SoX is invoked at the Windows command line with the program name

Let's say we want a message to be appended to the Repeater Initial and Normal ID Messages while the repeater is operating on battery power.  We have wired our Logic Input #4 to detect a power failure.  

We program User Message #1 with the speech we want to hear, like this (see page 6-63):

; Say "power fail thirteen point two volts" or whatever the actual voltage is
99 33 0015 9960 0148 0766 9852 01 00 9960 0150 *

You can test this message with this command:

99 34 0015 *