[Verizon Galaxy Note 4 Android Development] hsbadr:
I'm testing Samsung SoundAlive audio effects, and you may use Viper4Android. However, if you need AudioFX, replace /system/etc/audio_effects.conf from 13.0-20160214 build (set permissions 0644 and reboot!).

audio_effects.conf

# 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 {
bundle {
path /system/lib/soundfx/libbundlewrapper.so
}
reverb {
path /system/lib/soundfx/libreverbwrapper.so
}
visualizer_sw {
path /system/lib/soundfx/libvisualizer.so
}
visualizer_hw {
path /system/lib/soundfx/libqcomvisualizer.so
}
downmix {
path /system/lib/soundfx/libdownmix.so
}
mysound {
path /system/lib/libmysound.so
}
loudness_enhancer {
path /system/lib/soundfx/libldnhncr.so
}
pre_processing {
path /system/lib/soundfx/libqcomvoiceprocessing.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 {
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_sw
uuid d069d9e0-8329-11df-9168-0002a5d5c51b
}
downmix {
library downmix
uuid 93f04452-e4fe-41cc-91f9-e475b6d1d69f
}
dha {
library mysound
uuid 263a88e0-50b1-11e2-bcfd-0800200c9a66
}
loudness_enhancer {
library loudness_enhancer
uuid fa415329-2034-4bea-b5dc-5b381c8d1e2c
}
aec {
library pre_processing
uuid 0f8d0d2a-59e5-45fe-b6e4-248c8a799109
}
ns {
library pre_processing
uuid 1d97bb0b-9e2f-4403-9ae3-58c2554306f8
}
}

# 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 0f8d0d2a-59e5-45fe-b6e4-248c8a799109
# }
# 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
#
pre_processing {
voice_communication {
aec {}
}
}