make
make install

libjack-jackd2  >= 1.9.8
liblilv         >= 0.14.2
libreadline     >= 6.2
lilv-utils      (optional)
fftw            (optional)
hylia           (optional)

sudo apt install libreadline-dev liblilv-dev lilv-utils libfftw3-dev libjack-jackd2-dev

$ ./mod-host -n -p 5555 -f 5556

-v, --verbose
    verbose messages

-p, --socket-port=<port>
    socket port definition

-f, --feedback-port<port>
    feedback port definition

-i, --interactive
    interactive shell mode

-n, --nofork 
    run in non-forking mode

-V, --version
    print program version and exit

-h, --help
    print help and exit

add <lv2_uri> <instance_number>
    * add an LV2 plugin encapsulated as a jack client, in activated state
    e.g.: add "http://lv2plug.in/plugins/eg-amp" 0
    instance_number must be any value between 0 ~ 9990, inclusively

remove <instance_number>
    * remove an LV2 plugin instance (and also the jack client)
    e.g.: remove 0
    when instance_number is -1 all plugins will be removed

activate <instance_number> <activate_value>
    * toggle effect activated state
    e.g.: activate 0 1
    if activate_value = 1 activate effect
    if activate_value = 0 deactivate effect

preload <lv2_uri> <instance_number>
    * add an LV2 plugin encapsulated as a jack client, in deactivated state
    e.g.: preload "http://lv2plug.in/plugins/eg-amp" 0
    instance_number must be any value between 0 ~ 9990, inclusively

preset_load <instance_number> <preset_uri>
    * load a preset state of an effect instance
    e.g.: preset_load 0 "http://drobilla.net/plugins/mda/presets#JX10-moogcury-lite"

preset_save <instance_number> <preset_name> <dir> <file_name>
    * save a preset state of an effect instance
    e.g.: preset_save 0 "My Preset" "/home/user/.lv2/my-presets.lv2" "mypreset.ttl"

preset_show <preset_uri>
    * show the preset information of requested URI
    e.g.: preset_show "http://drobilla.net/plugins/mda/presets#EPiano-bright"

connect <origin_port> <destination_port>
    * connect two jack ports
    e.g.: connect "system:capture_1" "effect_0:in"

disconnect <origin_port> <destination_port>
    * disconnect two jack ports
    e.g.: disconnect "system:capture_1" "effect_0:in"

disconnect_all <origin_port>
    * disconnect all connections of a jack port
    e.g.: disconnect_all "effect_0:in"

bypass <instance_number> <bypass_value>
    * toggle effect processing
    e.g.: bypass 0 1
    if bypass_value = 1 bypass effect
    if bypass_value = 0 process effect

param_set <instance_number> <param_symbol> <param_value>
    * set the value of a control port
    e.g.: param_set 0 "gain" 2.5

param_get <instance_number> <param_symbol>
    * get the value of a control port
    e.g.: param_get 0 "gain"

param_monitor <instance_number> <param_symbol> <cond_op> <value>
    * monitor a control port according to a condition
    e.g: param_monitor 0 "gain" ">" 2.5

patch_set <instance_number> <property_uri> <value>
    * set the value of a control port
    e.g.: patch_set 0 "gain" 2.5

patch_get <instance_number> <property_uri>
    * get the value of a control port
    e.g.: patch_get 0 "gain"

licensee <instance_number>
    * get the licensee name for a commercial plugin
    e.g.: licensee 0

monitor <addr> <port> <status>
    * open a socket port for monitoring parameter changes
    e.g: monitor localhost 12345 1
    if status = 1 start monitoring
    if status = 0 stop monitoring

monitor_output <instance_number> <param_symbol>
    * request monitoring of an output control port (on the feedback port)
    e.g.: monitor_output 0 "meter"

midi_learn <instance_number> <param_symbol> <minimum> <maximum>
    * start MIDI learn for a control port
    e.g.: midi_learn 0 "gain" 0.0 1.0

midi_map <instance_number> <param_symbol> <midi_channel> <midi_cc> <minimum> <maximum>
    * map a MIDI controller to a control port
    e.g.: midi_map 0 "gain" 0 7 0.0 1.0
    a non-standard midi_cc value of 131 (0x83) is used for pitchbend

midi_unmap <instance_number> <param_symbol>
    * unmap the MIDI controller from a control port
    e.g.: midi_unmap 0 "gain"

monitor_audio_levels <source_port_name> <enable>
    * monitor audio levels for a specific jack port (on the feedback port)
    e.g.: monitor_audio_levels "system:capture_1" 1

monitor_midi_program <midi_channel> <enable>
    * listen to MIDI program change messages (on the feedback port)
    e.g.: monitor_midi_program 0 1

set_midi_program_change_pedalboard_bank_channel <enable> <midi_channel>
    * set the MIDI channel which changes pedalboard banks on MIDI program change. <midi_channel> is in the range of [0,15].
    e.g.: set_midi_program_change_pedalboard_bank_channel 1 5 to enable listening for bank changes on channel 6

set_midi_program_change_pedalboard_snapshot_channel <enable> <midi_channel>
    * set the MIDI channel which changes pedalboard snapshots on MIDI program change. <midi_channel> is in the range of [0,15].
    e.g.: set_midi_program_change_pedalboard_snapshot_channel 1 4 to enable listening for preset changes on channel 5

cc_map <instance_number> <param_symbol> <device_id> <actuator_id> <label> <value> <minimum> <maximum> <steps> <extraflags> <unit> <scalepoints_count> <scalepoints...>
    * map a Control Chain actuator to a control port
    e.g.: cc_map 0 "gain" 0 1 "Gain" 0.0 -24.0 3.0 33 0 "dB" 0

cc_unmap <instance_number> <param_symbol>
    * unmap the Control Chain actuator from a control port
    e.g.: cc_unmap 0 "gain"

cc_value_set <instance_number> <param_symbol> <value>
    * set the value of a  mapped Control Chain actuator
    e.g.: cc_value_set 0 "gain" 2.5

cv_map <instance_number> <param_symbol> <source_port_name> <minimum> <maximum> <operational-mode>
    * map a CV source port to a control port, operational-mode being one of '-', '+', 'b' or '='
    e.g.: cv_map 0 "gain" "AMS CV Source:CV Out 1" -24.0 3.0 =

cv_unmap <instance_number> <param_symbol>
    * unmap the CV source port actuator from a control port
    e.g.: cv_unmap 0 "gain"

cpu_load
    * return current jack cpu load

load <file_name>
    * load a history command file
    * dummy way to save/load workspace state
    e.g.: load my_setup

save <file_name>
    * saves the history of typed commands
    * dummy way to save/load workspace state
    e.g.: save my_setup

bundle_add <bundle_path>
    * add a bundle to the running lv2 world
    e.g.: bundle_add "/path/to/bundle.lv2"

bundle_remove <bundle_path> <resource>
    * remove a bundle from the running lv2 world
    e.g.: bundle_remove "/path/to/bundle.lv2" ""

feature_enable <feature> <enable>
    * enable or disable a feature
    * feature can be one of "aggregated-midi", "freewheeling" or "processing"
    * the "aggregated-midi" feature requires the use of jack2 and mod-midi-merger to be installed system-wide
    e.g.: feature_enable link 1

set_bpm <beats_per_minute>
    * set the global beats per minute transport value
    e.g.: set_bpm 120

set_bpb <beats_per_bar>
    * set the global beats per bar transport value
    e.g.: set_bpb 4

transport <rolling> <beats_per_bar> <beats_per_minute>
    * change the global transport state
    e.g.: transport 1 4 120

transport_sync <mode>
    * change the transport sync mode
    * mode can be one of "none", "link" or "midi"
    e.g.: transport_sync "midi"

output_data_ready
    * report feedback port ready for more messages

help
    * show a help message

quit
    bye!

resp <status> [value]