[HTC 10 Themes, Apps, and Mods] Sir-Shadow:
This is what I did to make it work on my HTC 10, and it works with Boom sound.

Installed V4A

as I use magisk, Installed V4A magisk module (because you can't install driver by V4A app)

in system/etc/audio_effects.conf I searched for "v4a"

this is my audio_effects.conf content

a# List of effect libraries to load. Each library element must contain a "path" element
# giving the full path of the library .so file.
# libraries {
# <lib name> {
# path <lib path>
# }
# }
libraries {
v4a_fx {
path /system/lib/soundfx/libv4a_fx_ics.so
}
# This is a proxy library that will be an abstraction for
# the HW and SW effects

#proxy {
#path /system/lib/soundfx/libeffectproxy.so
#}

# This is the SW implementation library of the effect
#libSW {
#path /system/lib/soundfx/libswwrapper.so
#}

# This is the HW implementation library for the effect
#libHW {
#path /system/lib/soundfx/libhwwrapper.so
#}

bundle {
path /system/lib/soundfx/libbundlewrapper.so
}
reverb {
path /system/lib/soundfx/libreverbwrapper.so
}
visualizer {
path /system/lib/soundfx/libvisualizer.so
}
downmix {
path /system/lib/soundfx/libdownmix.so
}
loudness_enhancer {
path /system/lib/soundfx/libldnhncr.so
}
}

# Default pre-processing library. Add to audio_effect.conf "libraries" section if
# audio HAL implements support for default software audio pre-processing effects
#
# pre_processing {
# path /system/lib/soundfx/libaudiopreprocessing.so
# }

# list of effects to load. Each effect element must contain a "library" and a "uuid" element.
# The value of the "library" element must correspond to the name of one library element in the
# "libraries" element.
# The name of the effect element is indicative, only the value of the "uuid" element
# designates the effect.
# The uuid is the implementation specific UUID as specified by the effect vendor. This is not the
# generic effect type UUID.
# effects {
# <fx name> {
# library <lib name>
# uuid <effect uuid>
# }
# ...
# }

effects {
v4a_standard_fx {
library v4a_fx
uuid 41d3c987-e6cf-11e3-a88a-11aba5d5c51b
}

# additions for the proxy implementation
# Proxy implementation
#effectname {
#library proxy
#uuid xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

# SW implemetation of the effect. Added as a node under the proxy to
# indicate this as a sub effect.
#libsw {
#library libSW
#uuid yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy
#} End of SW effect

# HW implementation of the effect. Added as a node under the proxy to
# indicate this as a sub effect.
#libhw {
#library libHW
#uuid zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz
#}End of HW effect
#} End of effect proxy

bassboost {
library bundle
uuid 8631f300-72e2-11df-b57e-0002a5d5c51b
}
virtualizer {
library bundle
uuid 1d4033c0-8557-11df-9f2d-0002a5d5c51b
}
equalizer {
library bundle
uuid ce772f20-847d-11df-bb17-0002a5d5c51b
}
volume {
library bundle
uuid 119341a0-8469-11df-81f9-0002a5d5c51b
}
reverb_env_aux {
library reverb
uuid 4a387fc0-8ab3-11df-8bad-0002a5d5c51b
}
reverb_env_ins {
library reverb
uuid c7a511a0-a3bb-11df-860e-0002a5d5c51b
}
reverb_pre_aux {
library reverb
uuid f29a1400-a3bb-11df-8ddc-0002a5d5c51b
}
reverb_pre_ins {
library reverb
uuid 172cdf00-a3bc-11df-a72f-0002a5d5c51b
}
visualizer {
library visualizer
uuid d069d9e0-8329-11df-9168-0002a5d5c51b
}
downmix {
library downmix
uuid 93f04452-e4fe-41cc-91f9-e475b6d1d69f
}
loudness_enhancer {
library loudness_enhancer
uuid fa415329-2034-4bea-b5dc-5b381c8d1e2c
}
}

# Default pre-processing effects. Add to audio_effect.conf "effects" section if
# audio HAL implements support for them.
#
# agc {
# library pre_processing
# uuid aa8130e0-66fc-11e0-bad0-0002a5d5c51b
# }
# aec {
# library pre_processing
# uuid bb392ec0-8d4d-11e0-a896-0002a5d5c51b
# }
# ns {
# library pre_processing
# uuid c06c8400-8e06-11e0-9cb6-0002a5d5c51b
# }

# Audio preprocessor configurations.
# The pre processor configuration consists in a list of elements each describing
# pre processor settings for a given input source. Valid input source names are:
# "mic", "camcorder", "voice_recognition", "voice_communication"
# Each input source element contains a list of effects elements. The name of the effect
# element must be the name of one of the effects in the "effects" list of the file.
# Each effect element may optionally contain a list of parameters and their
# default value to apply when the pre processor effect is created.
# A parameter is defined by a "param" element and a "value" element. Each of these elements
# consists in one or more elements specifying a type followed by a value.
# The types defined are: "int", "short", "float", "bool" and "string"
# When both "param" and "value" are a single int, a simple form is allowed where just
# the param and value pair is present in the parameter description
# pre_processing {
# <input source name> {
# <fx name> {
# <param 1 name> {
# param {
# int|short|float|bool|string <value>
# [ int|short|float|bool|string <value> ]
# ...
# }
# value {
# int|short|float|bool|string <value>
# [ int|short|float|bool|string <value> ]
# ...
# }
# }
# <param 2 name > {<param> <value>}
# ...
# }
# ...
# }
# ...
# }

#
# TODO: add default audio pre processor configurations after debug and tuning phase
#

as you can see we have

v4a_fx {
path /system/lib/soundfx/libv4a_fx_ics.so
}

under libraries and we have

v4a_standard_fx {
library v4a_fx
uuid 41d3c987-e6cf-11e3-a88a-11aba5d5c51b
}

under effects

you have to copy these line to htc_audio_effects.conf exactly in the same sections. libraries and effects