The SooperLooper engine is controlled via OSC. An incomplete specification for the API is described below.

OSC interface to SooperLooper engine
Arguments are prefixed with a letter: where  s = string, i = integer, f = float

PING the engine

 /ping s:return_url s:return_path

 If engine is there, it will respond with to the given URL and PATH
  with an OSC message with arguments:
     s:hosturl  s:version  i:loopcount


Loop commands and parameter gets/sets paths are all prefixed with:
  /sl/#/   where # is the loop index starting from 0. 
Specifying -1 will apply the command or operation to all loops.
Specifying -3 will apply the command or operation to the selected loop.

COMMANDS:


/sl/#/down s:cmdname
  command press

/sl/#/up s:cmdname
  command release

/sl/#/forceup s:cmdname
  forced release to do SUS-like actions

/sl/#/hit s:cmdname
  A single hit only, no press-release action

  Where cmdname is one of the following:

  record
  overdub
  multiply
  insert
  replace
  reverse
  mute
  undo
  redo
  oneshot
  trigger
  substitute
  undo_all
  redo_all
  mute_on
  mute_off
  solo
  pause
  solo_next
  solo_prev
  record_solo
  record_solo_next
  record_solo_prev
  set_sync_pos
  reset_sync_pos

SET PARAMETER VALUES

/sl/#/set  s:control  f:value
   To set a parameter for a loop.

 where control is one of:

  rec_thresh  	:: expected range is 0 -> 1
  feedback    	:: range 0 -> 1
  dry         	:: range 0 -> 1
  wet         	:: range 0 -> 1
  input_gain    :: range 0 -> 1
  rate        	:: range 0.25 -> 4.0
  scratch_pos  	 :: 0 -> 1 
  delay_trigger  :: any changes
  quantize       :: 0 = off, 1 = cycle, 2 = 8th, 3 = loop
  round          :: 0 = off,  not 0 = on 
  redo_is_tap    :: 0 = off,  not 0 = on 
  sync           :: 0 = off,  not 0 = on 
  playback_sync  :: 0 = off,  not 0 = on 
  use_rate       :: 0 = off,  not 0 = on 
  fade_samples   :: 0 -> ...
  use_feedback_play   :: 0 = off,  not 0 = on 
  use_common_ins   :: 0 = off,  not 0 = on 
  use_common_outs   :: 0 = off,  not 0 = on 
  relative_sync   :: 0 = off, not 0 = on
  use_safety_feedback   :: 0 = off, not 0 = on
  pan1         	:: range 0 -> 1
  pan2         	:: range 0 -> 1
  pan3         	:: range 0 -> 1
  pan4         	:: range 0 -> 1
  input_latency :: range 0 -> ...
  output_latency :: range 0 -> ...
  trigger_latency :: range 0 -> ...
  autoset_latency  :: 0 = off, not 0 = on
  mute_quantized  :: 0 = off, not 0 = on
  overdub_quantized :: 0 == off, not 0 = on

GET PARAMETER VALUES

/sl/#/get  s:control  s:return_url  s: return_path

  Which returns an OSC message to the given return url and path with
  the arguments:
      i:loop_index  s:control  f:value
	
 Where control is one of the above or:

  state   ::   -1 = unknown,
		0 = Off
		1 = WaitStart
		2 = Recording
		3 = WaitStop
		4 = Playing
		5 = Overdubbing
		6 = Multiplying
		7 = Inserting
		8 = Replacing
		9 = Delay
		10 = Muted
		11 = Scratching
		12 = OneShot
		13 = Substitute
		14 = Paused

  next_state  :: same as state

  loop_len  :: in seconds
  loop_pos  :: in seconds
  cycle_len :: in seconds
  free_time :: in seconds
  total_time :: in seconds
  rate_output 
  in_peak_meter  :: absolute float sample value 0.0 -> 1.0 (or higher)
  out_peak_meter  :: absolute float sample value 0.0 -> 1.0 (or higher)
  is_soloed       :: 1 if soloed, 0 if not

SAVE/LOAD

/sl/#/load_loop   s:filename  s:return_url  s:error_path
   loads a given filename into loop, may return error to error_path

/sl/#/save_loop   s:filename  s:format  s:endian  s:return_url  s:error_path
   saves current loop to given filename, may return error to error_path
   format and endian currently ignored, always uses 32 bit IEEE float WAV

/save_session   s:filename  s:return_url  s:error_path
   saves current session description to filename.

/load_session   s:filename  s:return_url  s:error_path
   loads and replaces the current session from filename.


GLOBAL PARAMETERS

/set  s:param  f:value
/get  s:param  s:return_url  s:retpath
   where param is one of:

  tempo  :: bpm
  eighth_per_cycle
  dry         	:: range 0 -> 1 affects common input passthru
  wet         	:: range 0 -> 1  affects common output level
  input_gain    :: range 0 -> 1  affects common input gain
  sync_source  :: -3 = internal,  -2 = midi, -1 = jack, 0 = none, # > 0 = loop number (1 indexed) 
  tap_tempo :: any changes
  save_loop :: any change triggers quick save, be careful
  auto_disable_latency  :: when 1, disables compensation when monitoring main inputs
  select_next_loop  :: any changes
  select_prev_loop  :: any changes
  select_all_loops   :: any changes
  selected_loop_num   :: -1 = all, 0->N selects loop instances (first loop is 0, etc) 

LOOP ADD/REMOVE

/loop_add  i:#channels  f:min_length_seconds
  adds a new loop with # channels and a minimum loop memory

/loop_del  i:loopindex
  a value of -1 for loopindex removes last loop, and is the only
  value currently recommended.


SHUTDOWN

/quit
   shutdown engine



REGISTER FOR CONTROL CHANGES

 The following messages register and unregister from update events
 which will be sent the returl and retpath specified.  The update OSC message
 has the following parameters:
     i:loop#  s:ctrl  f:control_value

 /sl/#/register_update  s:ctrl s:returl s:retpath
 /sl/#/unregister_update  s:ctrl s:returl s:retpath

     registers/unregisters to receive updates for a given input control when
     any other client changes it.

 /sl/#/register_auto_update  s:ctrl i:ms_interval s:returl s:retpath
 /sl/#/unregister_auto_update  s:ctrl s:returl s:retpath

    registers/unregisters for automatic repeated updates at the given
    interval (currently ignored, and always at 100ms intervals).
    This is handy for receiving updates for output controls such as state
    and position.  The message is only sent if the control has changed since the
    last send.

 
 /register_update  s:ctrl s:returl s:retpath
 /unregister_update  s:ctrl s:returl s:retpath
 /register_auto_update  s:ctrl i:ms_interval s:returl s:retpath
 /unregister_auto_update  s:ctrl s:returl s:retpath

    These are the global control equivalents to the above.

 Finally, there is the command to register for any changes in loop count:

 /register s:returl s:retpath

When the loop count changes it will send the same message that the /ping response does.


MIDI BINDING CONTROL

  More details forthcoming......

 /get_all_midi_bindings  s:returl  s:retpath
    

 /remove_midi_binding  s:binding_serialization s:options
	 
 /add_midi_binding  s:binding_serialization s:options

 /clear_midi_bindings
		
 /load_midi_bindings  s:binding_filename s:options

 /save_midi_bindings  s:binding_filename s:options

 /learn_midi_binding  s:binding_serialization s:options  s:returl s:retpath

 /get_next_midi_event    s:returl  s:retpath
    return next midi event in a binding serialization

 /cancel_midi_learn    s:returl  s:retpath
    cancel learn or get next midi event in a binding serialization

 /cancel_get_next_midi  s:returl  s:retpath