https://github.com/PaulStoffregen/Audio/pull/119

https://forum.pjrc.com/threads/27409-Play-RAW-from-Serial-Flash?p=77666#post77666

Change width to pulseWidth, update the example, keywords.txt and
gui/list.htm

pulse plus example

While changing everything else I also modified most things regarding
gain or volume from using 0 to 100 (or -100 thru 0 to 100) to using 1
(or -1 to 1) with only one exception I can think of right now in the
autoVolumeControl(..); - I modified all examples I found .volume or
similar in to suit.

I found opportunity to write these changes, I did not have a chance to
test much more extensively than just compiling it. I will have a chance
to test them by about 24 hours time.

I am tired of seeing Serial.begin(9600); where 9600 is not going to be
used at all. Can Serial.begin(Serial.baud()); be acceptable?

Untested, will test it personally in next couple of days but sincerely
expect it will work so committing.

Todo: Test properly. Improve comments and possibly link to wiring
example(s).

modified an older 'detached' copy of the example source to try multiple
filters out and didn't notice the old comments till reviewing later.

Simplistic visual peak meter just outputs to terminal.