[Nexus 6  General] bamfsig45:
If Im not mistaken, that guide is for kitkat 4.4.4. Lollipop Mixer_paths appear different. Your file on Dropbox is correct, but I would unlink to that guide.

Editing the Headphone Path is not going to work. Here is the Lollipop headphone path

<path name="headphones">
<ctl name="SLIM RX1 MUX" value="AIF1_PB"/>
<ctl name="SLIM RX6 MUX" value="AIF2_PB"/>
<ctl name="SLIM RX2 MUX" value="AIF1_PB"/>
<ctl name="SLIM RX7 MUX" value="AIF2_PB"/>
<ctl name="SLIM_0_RX Channels" value="Two"/>
<ctl name="RX1 MIX1 INP1" value="RX1"/>
<ctl name="RX1 MIX1 INP2" value="RX6"/>
<ctl name="RX2 MIX1 INP1" value="RX2"/>
<ctl name="RX2 MIX1 INP2" value="RX7"/>
<ctl name="AIF3_CAP Mixer SLIM TX3" value="1"/>
<ctl name="AIF3_CAP Mixer SLIM TX5" value="1"/>
<ctl name="SLIM TX3 MUX" value="RMIX1"/>
<ctl name="SLIM TX5 MUX" value="RMIX2"/>
<ctl name="CLASS_H_DSM MUX" value="DSM_HPHL_RX1"/>
<ctl name="HPHL DAC Switch" value="1"/>
<ctl name="COMP1 Switch" value="1"/>
</path>
<path name="line">
<path name="headphones"/>

There is also a Speaker and Headphone path which I tried and didnt change anything either.

<path name="speaker-and-headphones">
<path name="headphones"/>
<ctl name="QUAT_MI2S_RX Channels" value="Two"/>
<ctl name="BOOST earpiece mode" value="Off"/>
<ctl name="BOOST Left Ch Select" value="3"/>
<ctl name="BOOST Right Ch Select" value="3"/>
<ctl name="BOOST_STUB Right Mixer right" value="1"/>
<ctl name="BOOST_STUB Left Mixer left" value="1"/>
</path>
<path name="speaker-and-line">
<path name="speaker-and-headphones"/>

The correct place to edit is below, and this is at the top of that .xml file

<ctl name="Voice Rx Device Mute" id="0" value="0"/>
<ctl name="Voice Rx Device Mute" id="1" value="-1"/>
<ctl name="Voice Rx Device Mute" id="2" value="20"/>
<ctl name="Voice Tx Mute" id="0" value="0"/>
<ctl name="Voice Tx Mute" id="1" value="-1"/>
<ctl name="Voice Tx Mute" id="2" value="500"/>
<ctl name="Voice Rx Gain" id="0" value="0"/>
<ctl name="Voice Rx Gain" id="1" value="-1"/>
<ctl name="Voice Rx Gain" id="2" value="20"/>
<ctl name="Voip Tx Mute" id="0" value="0"/>
<ctl name="Voip Tx Mute" id="1" value="500"/>
<ctl name="Voip Rx Gain" id="0" value="0"/>
<ctl name="Voip Rx Gain" id="1" value="20"/>
<ctl name="Voip Mode Config" value="12"/>
<ctl name="Voip Rate Config" value="0"/>
<ctl name="Voip Evrc Min Max Rate Config" id="0" value="1"/>
<ctl name="Voip Evrc Min Max Rate Config" id="1" value="4"/>
<ctl name="Voip Dtx Mode" value="0"/>
<ctl name="TTY Mode" value="OFF"/>
<ctl name="LINEOUT1 Volume" value="0"/>
<ctl name="LINEOUT2 Volume" value="0"/>
<ctl name="LINEOUT3 Volume" value="0"/>
<ctl name="LINEOUT4 Volume" value="0"/>
<ctl name="HPHL Volume" value="20"/>
<ctl name="HPHR Volume" value="20"/>
[COLOR="Red"]<ctl name="RX1 Digital Volume" value="95"/>
<ctl name="RX2 Digital Volume" value="95"/>[/COLOR]
<ctl name="RX3 Digital Volume" value="84"/>
<ctl name="RX4 Digital Volume" value="84"/>
<ctl name="RX5 Digital Volume" value="84"/>
<ctl name="RX6 Digital Volume" value="84"/>
<ctl name="RX7 Digital Volume" value="84"/>

RX1 and RX2 are the line out headphone volumes.

If Im wrong, please let me know but I edited this file on day 2 of having my Nexus 6 and its worked great.