Hi all...
(Apologies for the delay but I have had other commitments. Also for any typos.)

@bakunin...
(Have you tried the code out at all to see what it does?)

1) I am not a software engineer, but a retired, mere amateur. ;o)
2) This project was for me to learn shell scripting, of which I know much more now than day one.
3) There are many functions inside the program that can't really be made simpler than they are and there are also some simple ones called regularly.
4) There are a lot of variables and all are used, there are no extras that have been found. I like _bash_'s flexibiilty and things that It, along with the Terminal, can do makes life interesting. Along the way I have discovered some strange effects of the hardware that I and I suspect nearly everyone else did not know.
5) Lastly a rewrite of the code would be difficult as it has evolved to become a tool that even I could not have imagined - back at the start of this project I bragged about doing this but never in my wildest dreams did I expect it to get where it is. It HAS had a write up in Linux Format Magazine and this is a shock to the system to say the least.
6) Fimally this script does everything EXCEPT build the external hardware for you...
A) Although unfinished, contains the circuits; so far.
B) Generates ALL necessary files plus have extras that you can use elsewhere as .WAV files.
C) Creates a working Audio Oscilloscope using text mode inside a terminal without the need for fancy graphics.
D) Uses 3 dedicated capture modes, along with 3 other modes that are platform specific.
E) Uses ONLY the mic/ear socket of an MBP 13 inch OSX 10.7.5 using the default bash terminal.
F) It has evolved over time.
G) And LBNL, I don't think this has ever been attempted anywhere elsebefore.
H) Capable of doing both AC and DC measurements to a minimum of 4 - 5 bit depth.
I) Other things that elude me at the moment.

It is designed to run on hopefully UNIX, definitely various Linux flavours in both 32 and 64 bit guises, CygWin and CygWin64 and MBP/iMac OSX 10.7.x minimum.

So to finalise, you have not annoyed me but it would be very difficult to start again with my current knowledge so I am coding this in its original coding style.

A listing of the files generated for the current version:-

Code:

-rw-r--r--  1 barrywalker  wheel  48000  5 Jun 13:14 0000000000.BIN
-rwxr--r--  1 barrywalker  wheel    503  5 Jun 13:14 1KHz-Test.sh
-rw-r--r--  1 barrywalker  wheel  80272  5 Jun 13:15 AudioScope.Manual
-rw-r--r--  1 barrywalker  wheel    327  5 Jun 13:15 AudioScope.config
-rw-r--r--  1 barrywalker  wheel    253  5 Jun 13:14 VERT_BAT.BAT
-rw-r--r--  1 barrywalker  wheel    295  5 Jun 13:14 VERT_DSP.sh
-rw-r--r--  1 barrywalker  wheel    336  5 Jun 13:14 VERT_SOX.sh
-rw-r--r--  1 barrywalker  wheel      1  5 Jun 13:14 dcdata.raw
-rw-r--r--  1 barrywalker  wheel  65580  5 Jun 13:15 pulse.wav
-rw-r--r--  1 barrywalker  wheel  65580  5 Jun 13:14 pulse1.wav
-rw-r--r--  1 barrywalker  wheel  65580  5 Jun 13:14 pulse2.wav
-rwxr-xr-x  1 barrywalker  wheel      1  5 Jun 13:14 pulsetest.sh
-rw-r--r--  1 barrywalker  wheel  48000  5 Jun 13:14 sample.raw
-rw-r--r--  1 barrywalker  wheel      1  5 Jun 13:14 signed16bit.txt
-rw-r--r--  1 barrywalker  wheel  65536  5 Jun 13:14 sinewave.raw
-rw-r--r--  1 barrywalker  wheel  65580  5 Jun 13:14 sinewave.wav
-rw-r--r--  1 barrywalker  wheel   8000  5 Jun 13:14 squarewave.raw
-rw-r--r--  1 barrywalker  wheel  65096  5 Jun 13:14 sweep.raw
-rw-r--r--  1 barrywalker  wheel  65140  5 Jun 13:14 sweep.wav
-rw-r--r--  1 barrywalker  wheel  32548  5 Jun 13:14 sweeper.raw
-rw-r--r--  1 barrywalker  wheel   8000  5 Jun 13:14 symmetricalwave.raw
-rw-r--r--  1 barrywalker  wheel  48000  5 Jun 13:15 waveform.raw
-rw-r--r--  1 barrywalker  wheel  65580  5 Jun 13:14 waveform.wav

@Corona688...
OK, maybe backwards compatibilty is not the phrase to use, however I do test on various platforms. Several Linux flavours using live DVDs, iMac and MBP, CygWin and CygWin64 of which the latter did show up a bug NOT even related to printf . I have even used the 'printf' inside /usr/bin/printf which does NOT allow escaped hex values but only octal ones but decided that the hex ones looked neater.

I would like professional opinions on trying it out in their UNIX flavours however, even if you don't like it.

And finally the variables are all used and none are detected as not being allocated during program run.

I hope this clears it up and the next upload will be the AC condition finalised with builds and calibration of the AC vertical axis.

The DC conditions will be much harder, Arduino and the first home built 'ALTDC' are done and coded for but not calibrated yet.