Taming Yosemite mic volume & AGC from Livecode

[Keith Clarke]

Thanks for the syntax Sean - that’ll at least get my colleagues out of the Terminal :-/

I’ll see if I can find a list of audio parameters that can be controlled via Applescript and have a play. :-)
Best,
Keith..

> On 20 Nov 2014, at 12:49, Sean Cole (Pi) <sean at pidigital.co.uk> wrote:
> 
> Hi Keith
> 
> From Livecode you could run your terminal script using the 'shell'
> function. i.e.:
> 
> shell("osascript -e repeat -e " &quote& "set volume input volume 15"
> &quote& " -e 'delay 1’ -e 'end repeat’")
> 
> 
> Of course you can then add in all sorts of parameters to the volume and
> delays etc. I'm sure you can get Auber-creative with this.
> 
> all the best
> 
> 
> Sean Cole
> *Pi Digital Productions Ltd*
> www.pidigital.co.uk
> 
> On 20 November 2014 10:25, Keith Clarke <keith.clarke at me.com> wrote:
> 
>> Hi Folks,
>> A question for any Mac audio experts in the virtual room.
>> 
>> The Problem
>> Some colleagues are having problems with multiple apps fighting over OSX
>> (Yosemite) microphone levels - and auto-adjusting the Automatic Gain
>> Control (AGC) in real-time. Apps include Skype, GotoMeeting, Webex, Google
>> hangouts, various soft-phones…
>> 
>> The biggest issue is apps ramping-up input volume/AGC to the max in the
>> background, creating noise, feedback & distortion for the other parties
>> involved - all without the (non-technical, BYOD) user being aware unless
>> they monitor system preferences all the while and ‘ride the faders’.
>> 
>> There are various threads around on settings for specific apps but I’ve
>> not found a definitive answer for overriding a bunch of disparate apps that
>> don’t play nice - on other folks’ machines. Furthermore, Yosemite’s System
>> preferences for Sound doesn’t seem to provide a true, ‘absolute' Master
>> Volume control - nor does it provide a master AGC On/Off.
>> 
>> Potential Solution?
>> So, I wonder if the way OSX audio settings work might allow a way to
>> create a simple 'one knob + one button' Livecode utility that they can have
>> on screen that drives Applescripts to get/set input volume and provide a
>> global AGC on/off switch?
>> 
>> So far we’ve tried this rather 'blunt instrument' volume reset via
>> Terminal to address some of the symptoms…
>> 
>> osascript -e repeat -e "set volume input volume 15” -e 'delay 1’ -e 'end
>> repeat’
>> 
>> … but it would be nice to refine the behaviour, add AGC control to prevent
>> unwanted adjustments and wrap it for use in a user-friendly Livecode stack.
>> 
>> Any ideas gratefully received. :-)
>> Best,
>> Keith..
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