ALSA: emu10k1: more documentation updates

- Clarify the data flows. For SB Live! I fixed only the most obvious
  point ("from" vs. "for").
- Mention 7.1 side channels on Audigy.
- Be unspecific about the output DACs on Audigy, as lots of variants
  actually exist (see emu_chip_details table).
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230825222157.170978-2-oswald.buddenhagen@gmx.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

Documentation/sound/cards/sb-live-mixer.rst

@@ -61,61 +61,61 @@ FX-bus
 
 ``name='Wave Playback Volume',index=0``
 ---------------------------------------
-This control is used to attenuate samples for left and right PCM FX-bus
+This control is used to attenuate samples from left and right PCM FX-bus
 accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples.
 The result samples are forwarded to the front DAC PCM slots of the AC97 codec.
 
 ``name='Wave Surround Playback Volume',index=0``
 ------------------------------------------------
-This control is used to attenuate samples for left and right PCM FX-bus
+This control is used to attenuate samples from left and right PCM FX-bus
 accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples.
 The result samples are forwarded to the rear I2S DACs. These DACs operates
 separately (they are not inside the AC97 codec).
 
 ``name='Wave Center Playback Volume',index=0``
 ----------------------------------------------
-This control is used to attenuate samples for left and right PCM FX-bus
+This control is used to attenuate samples from left and right PCM FX-bus
 accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples.
 The result is mixed to mono signal (single channel) and forwarded to
 the ??rear?? right DAC PCM slot of the AC97 codec.
 
 ``name='Wave LFE Playback Volume',index=0``
 -------------------------------------------
-This control is used to attenuate samples for left and right PCM FX-bus
+This control is used to attenuate samples from left and right PCM FX-bus
 accumulators. ALSA uses accumulators 0 and 1 for left and right PCM.
 The result is mixed to mono signal (single channel) and forwarded to
 the ??rear?? left DAC PCM slot of the AC97 codec.
 
 ``name='Wave Capture Volume',index=0``, ``name='Wave Capture Switch',index=0``
 ------------------------------------------------------------------------------
-These controls are used to attenuate samples for left and right PCM FX-bus
+These controls are used to attenuate samples from left and right PCM FX-bus
 accumulator. ALSA uses accumulators 0 and 1 for left and right PCM.
 The result is forwarded to the ADC capture FIFO (thus to the standard capture
 PCM device).
 
 ``name='Synth Playback Volume',index=0``
 ----------------------------------------
-This control is used to attenuate samples for left and right MIDI FX-bus
+This control is used to attenuate samples from left and right MIDI FX-bus
 accumulators. ALSA uses accumulators 4 and 5 for left and right MIDI samples.
 The result samples are forwarded to the front DAC PCM slots of the AC97 codec.
 
 ``name='Synth Capture Volume',index=0``, ``name='Synth Capture Switch',index=0``
 --------------------------------------------------------------------------------
-These controls are used to attenuate samples for left and right MIDI FX-bus
-accumulator. ALSA uses accumulators 4 and 5 for left and right PCM.
+These controls are used to attenuate samples from left and right MIDI FX-bus
+accumulator. ALSA uses accumulators 4 and 5 for left and right MIDI samples.
 The result is forwarded to the ADC capture FIFO (thus to the standard capture
 PCM device).
 
 ``name='Surround Playback Volume',index=0``
 -------------------------------------------
-This control is used to attenuate samples for left and right rear PCM FX-bus
+This control is used to attenuate samples from left and right rear PCM FX-bus
 accumulators. ALSA uses accumulators 2 and 3 for left and right rear PCM samples.
 The result samples are forwarded to the rear I2S DACs. These DACs operate
 separately (they are not inside the AC97 codec).
 
 ``name='Surround Capture Volume',index=0``, ``name='Surround Capture Switch',index=0``
 --------------------------------------------------------------------------------------
-These controls are used to attenuate samples for left and right rear PCM FX-bus
+These controls are used to attenuate samples from left and right rear PCM FX-bus
 accumulators. ALSA uses accumulators 2 and 3 for left and right rear PCM samples.
 The result is forwarded to the ADC capture FIFO (thus to the standard capture
 PCM device).
@@ -134,7 +134,7 @@ to the ??rear?? left DAC PCM slot of the AC97 codec.
 
 ``name='AC97 Playback Volume',index=0``
 ---------------------------------------
-This control is used to attenuate samples for left and right front ADC PCM slots
+This control is used to attenuate samples from left and right front ADC PCM slots
 of the AC97 codec. The result samples are forwarded to the front DAC PCM
 slots of the AC97 codec.
 
@@ -145,7 +145,7 @@ slots of the AC97 codec.
 
 ``name='AC97 Capture Volume',index=0``
 --------------------------------------
-This control is used to attenuate samples for left and right front ADC PCM slots
+This control is used to attenuate samples from left and right front ADC PCM slots
 of the AC97 codec. The result is forwarded to the ADC capture FIFO (thus to
 the standard capture PCM device).