Well... "sorta". :-)

Basically, what you're doing there is you're talking to the audio hardware directly, and telling it to flip a transistor-level switch to:

1) Enable the microphone input

...then another to:

2) Patch the microphone input directly to the speaker output

...then set some transistor-level variables to:

3) Increase the input gain
4) Increase the output gain (volume)


'cause I'm a nosy snot and spend my normal working hours looking at things we can do with -our- hardware platform (I work for VMware, Inc.)... so it was not unexpected that I'd spend some time nosing around the ProcFS and SysFS structures looking for as-yet undocumented things on the N770 as well. :-)