[linux-audio-user] Anybody know the use of these?

Hi all. Just got Slackware 8.1 up and running with kernel 2.4.20 and ALSA 0.9rc6. I have a TerraTec DMX 6Fire 24/96 card. The chipset it uses is an Envy24. I am wondering what all the different mixer options are for. These are taken from alsamixer: * IEC958 * IEC958 1 * ADC -- I think this is a line input. * ADC 1-5 -- I also think these are inputs. * Analog Input select * Breakbox LED * DAC -- These are the outputs. I know these, I have 6 of them. * Deemphasis -- I have 3 of these. * Front digital input * H/W -- I have 6 of these. * IPGA Analog -- I have 6 of these. * Multi -- I have 10 of these. * Multi Capture -- I have 10 of these. *Multi Track Internal Clock -- I think this has something to do with recording. * Multi Track Peak -- I have 4 of these. * Multi Track Rate Locking * Multi Track Rate Reset * Multi Track Volume Rate * Optical Digital Input -- Digital connectors on the front panel I presume. * Phone Analog Input -- Self explanetory. Any help as to what these all are would be much appreciated. Thanks Luke.