> On Tue, Mar 18, 2014 at 08:47:38AM +0100, Clemens Ladisch wrote: >Roger wrote: >> I keep getting the following error whenever specifying -c 1 or --channels=1, or >> specifying any number of channels less than two channels when using an ASUS >> Essence STX soundcard and recording using the microphone line having a TRS >> jack. > >The CMI8788 chip supports only channel pairs. > >> If I'm not mistaken, the jacks are wired to detect when a TS or TRS phone jack >> is inserted. > >There is no such detection. When "Line" is selected as capture source, >the input jack is routed directly to the ADC; when any other sources are >selected, the inputs are routed through the analog section of the >CMI9780 chip, which then acts as a microphone preamp and mixer. Thanks for the clarification. I think I just noticed this yesterday after plugging in a XLR microphone using a TS (or two conductor) phono jack into the combo Microphone/Line Input of the Xonar card. Since the microphone worked, I speculated 5 volts was still somehow getting to the microphone in some fashion, regardless of using a TS or TRS connector. Further testing has also proven the microphone boost has not affect to the line input or when switching to Line. This has helped greatly, as I'm now set to further test using a ART Tube MP Studio (V3) pre-amp for amplifying my XLR microphone connected to the switched Line/Microphone Input of the Xonar card. -- Roger http://rogerx.freeshell.org/ ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
