[Elecraft] K3 LINE Out mixes KRX3 and main output?

[Kok Chen]

On Jan 31, 2009, at 9:16 PM, Joe Subich, W4TV wrote:
>> For the device in question, Griffin iMic, this doesn't seem to be the
>> case. It does not separate enumerations for independently setting  
>> left
>> and right input gain. It does support stereo input, just not two
>> mic/line gain controls.
>
> I don't know about the iMic - Chen would though.

It depends on the generation of the Griffin Technology iMic.

I have three generations of iMic, dating back from more than 5 years  
ago.  The are the grey disk shaped ones, not the current-generation  
white ones.

The oldest one had a 20 bit input codec, with no digital attenuator,  
no left, no right, no Master.

The next generation is also 20 bits, but it has independent left and  
right attenuators (as seen from Core Audio -- I don't use Port Audio),  
but no master attenuator.

Both of the above have 20 bit codecs in them, but uses the USB Audio  
Interface class and you can only see 16 bits (they don't need special  
drivers, but you also don't see 20 bits, HI).

After that (and I believe it is true with the white bodied ones) they  
went to a 16 bit codec.  Mine (still a gray body) only has a master  
level control but no individual left and right controls.

If you are using Mac OS X, the easiest thing is to launch the Audio  
MIDI Setup utility that is in /Applications/Utilities.  Audio MIDI  
Setup also uses Core Audio.  There are three slider associated with  
each sound card's "volume," a Master slider, and channels 1 (left) and  
2 (right).  If a control is not available, it will be grayed out.

The microKeyer II, for example, has the Master control grayed out but  
the left and right channels are independently adjustable.  My  
digiKeyer uses the Burr-Brown PCM2902; when using Core Audio, there is  
no master, left nor right controls.

73
Chen, W7AY