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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
