[OnePlus X Q&A, Help & Troubleshooting] powermetza:
I tried to edit mixer_paths.xml but I really don't know where to modify. In the Oneplus One guide is easy to modify. On our phone is more complicated. I want to modify only In-Call volume.

Below are all the options that are related to the volume. I think that the In-Call volume is on "handset" and "voip-handset" and "anc-handset".

<path name="speaker">
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="RX3 MIX1 INP1" value="RX1" />
<ctl name="RDAC5 MUX" value="DEM3_INV" />
<ctl name="COMP2 Switch" value="1" />
<ctl name="LINEOUT1 Volume" value="13" />
<ctl name="LINEOUT3 Volume" value="13" />
<ctl name="RX3 Digital Volume" value="80" />
<ctl name="RX4 Digital Volume" value="80" />
<ctl name="SPKR Enable" value="1" />
</path>

<path name="handset">
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="One" />
<ctl name="RX1 MIX1 INP1" value="RX1" />
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1" />
<ctl name="DAC1 Switch" value="1" />
<ctl name="RX1 Digital Volume" value="84" />
</path>

<path name="voip-handset">
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="One" />
<ctl name="RX1 MIX1 INP1" value="RX1" />
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1" />
<ctl name="DAC1 Switch" value="1" />
<ctl name="RX1 Digital Volume" value="78" />
</path>

<path name="anc-handset">
<ctl name="ANC Function" value="ON" />
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="One" />
<ctl name="RX1 MIX1 INP1" value="RX1" />
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1" />
<ctl name="DAC1 Switch" value="1" />
<ctl name="RX1 Digital Volume" value="81" />
<ctl name="ANC Slot" value="6" />
<ctl name="ANC1 MUX" value="DMIC4" />
<ctl name="ANC1 FB MUX" value="EAR_HPH_L" />
</path>

<path name="headphones">
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM RX2 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="Two" />
<ctl name="RX1 MIX1 INP1" value="RX1" />
<ctl name="RX2 MIX1 INP1" value="RX2" />
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1" />
<ctl name="HPHL DAC Switch" value="1" />
<ctl name="COMP1 Switch" value="1" />
<ctl name="RX1 Digital Volume" value="81" />
<ctl name="RX2 Digital Volume" value="81" />
<ctl name="HPHL Volume" value="20" />
<ctl name="HPHR Volume" value="20" />
</path>

<path name="speaker-and-headphones">
<path name="headphones" />
<ctl name="RX1 Digital Volume" value="76" />
<ctl name="RX2 Digital Volume" value="76" />
<ctl name="RX3 MIX1 INP1" value="RX1" />
<ctl name="RDAC5 MUX" value="DEM3_INV" />
<ctl name="COMP2 Switch" value="1" />
<ctl name="LINEOUT1 Volume" value="13" />
<ctl name="LINEOUT3 Volume" value="13" />
<ctl name="RX3 Digital Volume" value="84" />
<ctl name="RX4 Digital Volume" value="84" />
<ctl name="SPKR Enable" value="1" />
</path>

<path name="anc-headphones">
<ctl name="ANC Function" value="ON" />
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM RX2 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="Two" />
<ctl name="RX1 MIX1 INP1" value="RX1" />
<ctl name="RX2 MIX1 INP1" value="RX2" />
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1" />
<ctl name="HPHL DAC Switch" value="1" />
<ctl name="HPHL Volume" value="14" />
<ctl name="HPHR Volume" value="14" />
<ctl name="RX1 Digital Volume" value="81" />
<ctl name="RX2 Digital Volume" value="81" />
<ctl name="ANC Slot" value="0" />
<ctl name="ANC1 FB MUX" value="EAR_HPH_L" />
<ctl name="ANC1 MUX" value="ADC3" />
<ctl name="ANC2 MUX" value="ADC4" />
<ctl name="ADC3 Volume" value="8" />
<ctl name="ADC4 Volume" value="8" />

<path name="speaker-and-anc-headphones">
<ctl name="ANC Function" value="ON" />
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM RX2 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="Two" />
<ctl name="RX3 MIX1 INP1" value="RX1" />
<ctl name="RX5 MIX1 INP1" value="RX2" />
<ctl name="RX4 DSM MUX" value="DSM_INV" />
<ctl name="RX6 DSM MUX" value="DSM_INV" />
<ctl name="LINEOUT1 Volume" value="13" />
<ctl name="LINEOUT2 Volume" value="13" />
<ctl name="LINEOUT3 Volume" value="13" />
<ctl name="LINEOUT4 Volume" value="13" />
<ctl name="RX1 MIX1 INP1" value="RX1" />
<ctl name="RX2 MIX1 INP1" value="RX2" />
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1" />
<ctl name="HPHL DAC Switch" value="1" />
<ctl name="HPHL Volume" value="14" />
<ctl name="HPHR Volume" value="14" />
<ctl name="RX1 Digital Volume" value="81" />
<ctl name="RX2 Digital Volume" value="81" />
<ctl name="ANC Slot" value="0" />
<ctl name="ANC1 FB MUX" value="EAR_HPH_L" />
<ctl name="ANC1 MUX" value="ADC3" />
<ctl name="ANC2 MUX" value="ADC4" />
<ctl name="ADC3 Volume" value="8" />
<ctl name="ADC4 Volume" value="8" />
</path>

<path name="voice-anc-headphones">
<ctl name="ANC Function" value="ON" />
<ctl name="SLIM RX1 MUX" value="AIF1_PB" />
<ctl name="SLIM RX2 MUX" value="AIF1_PB" />
<ctl name="SLIM_0_RX Channels" value="Two" />
<ctl name="RX1 MIX1 INP1" value="RX1" />
<ctl name="RX2 MIX1 INP1" value="RX2" />
<ctl name="IIR1 Enable Band1" value="1" />
<ctl name="IIR1 Enable Band2" value="1" />
<ctl name="IIR1 Enable Band3" value="1" />
<ctl name="IIR1 Enable Band4" value="1" />
<ctl name="IIR1 Enable Band5" value="1" />
<ctl name="IIR1 INP1 Volume" value="62" />
<ctl name="RX1 MIX2 INP1" value="IIR1" />
<ctl name="RX2 MIX2 INP1" value="IIR1" />
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1" />
<ctl name="HPHL DAC Switch" value="1" />
<ctl name="HPHL Volume" value="14" />
<ctl name="HPHR Volume" value="14" />
<ctl name="RX1 Digital Volume" value="81" />
<ctl name="RX2 Digital Volume" value="81" />
<ctl name="ANC Slot" value="0" />
<ctl name="ANC1 FB MUX" value="EAR_HPH_L" />
<ctl name="ANC1 MUX" value="ADC3" />
<ctl name="ANC2 MUX" value="ADC4" />
<ctl name="ADC3 Volume" value="8" />
<ctl name="ADC4 Volume" value="8" />
</path>